Problems with Hughes Whiplash cam in 383
#2480283
04/10/18 12:05 AM
04/10/18 12:05 AM
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Joined: Jun 2013
Posts: 869 Keizer, Oregon U.S.A.
elmor353
OP
super stock
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OP
super stock
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Keizer, Oregon U.S.A.
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Recently put a Hughes Whiplash cam in a 71 383 and I'm having some problems. According to their website, you should be able to use a stock converter with this cam. It kept choking down the engine and dying when put in gear, so I replaced the stock converter with a 2800 stall unit. It's better, but I still have trouble keeping it running in gear. It acts almost like there is a vacuum leak somewhere. It is a 71 383 that was freshened up. 8.5 to 1 compression, fresh set of 346 heads with valve springs to match the cam, torker intake, Hooker super comps, 3310 Holley carb, factory single point distributor. I have replaced the intake gaskets using a new bathtub with the Fel-pro sandwich gaskets. I checked the carb base to make sure it isn't warped. This engine ran fine with the same set up before, the only difference was a factory cam and a Carter AVS carb. I have tried the avs with this cam and it runs the same as the Holley. I installed the cam straight up,should I advance it a couple degrees? I'm drawing a blank here.
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Re: Problems with Hughes Whiplash cam in 383
[Re: krautrock]
#2480301
04/10/18 12:59 AM
04/10/18 12:59 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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yes you should advance the cam, prob 4*. you are also going to want to run alot of initial ignition advance, you have to modify the advance plates in the dist so your total timing will be proper. Agreed, & rework the timing first (& if you adv the cam then the timing needs to be reworked again). bump up the initial for a start, what are you running now?
live every 24 hour block of time like it's your last day on earth
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480320
04/10/18 01:40 AM
04/10/18 01:40 AM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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Sobieski Wi
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Trouble keeping it running in gear , how many Rpms does it drop in gear versus park , you mentioned vacuum leak - Did you spray looking for leak
Factory single point distributor , with the 1971 electronic retard box on distributor ?
I would bee looking at dwell versus timing versus points versus distributor springs especially if factory original
Distributor intermediate shaft and rotor position versus spark plug wiring order
Timing set position dot to dot , double check if you only replaced the camshaft
Sounds like your overlooking something simple
Torque Converter would have been the last thing I would have thought of based on what your saying
Last edited by bee1971; 04/10/18 01:58 AM.
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480345
04/10/18 05:11 AM
04/10/18 05:11 AM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
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The torquer is a really poor intake and hard to tune a carb to work on IMHO, need a performer or perf rpm, or a stock intake. The only good single plane is Holley street Dominator.
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480379
04/10/18 10:06 AM
04/10/18 10:06 AM
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Joined: Mar 2005
Posts: 1,406 New Jersey, USA
yella71
pro stock
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I love it when people start changing out carbs..... "I just did this and now it runs terrible" did you use any real diagnostic tools or are you just going to keep changing parts till you find something that fixes it? did you check lifter preload? did you put a vacuum gauge on the motor to see where it is? doesn't sound like it. keep changing carbs....
71 challenger convertable, 64 sport fury 383 ci with factory air
99 sebring convertable
89 CTD pup
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480419
04/10/18 12:02 PM
04/10/18 12:02 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
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may need more initial timing; which the distributor should be reworked to reduce centrifugal degrees in it. single plane intakes/low vacuum cams/low compression/high overlap aren't a good mix for something your going to drive. power valve in carb may need changed. to me this is the perfect example for not over camming a 383.
just looked at hugh's website. that cam has 21 degrees of overlap at .050". that's nearly identical to the 284/.484 cam. in my opinion, over cammed for 8.5:1 compression 383 and definitely won't run thru stock exhaust manifolds (if they're being used).
Last edited by lewtot184; 04/10/18 12:10 PM.
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480430
04/10/18 12:24 PM
04/10/18 12:24 PM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
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I'd get it running with points. Each change made adds another variable. Find the reason its got no power. http://www.hughesengines.com/Index/produ...mp;partid=30172over 230* on a 383, it will want at least 16* initial and maybe up to 20*. Once that's done and off idle is OK, the rest of the curve can be corrected; either by moving the both spring perches out, and if needed by also shortening the slots. Depends on what the factory curve looks like to begin with. Tach - for idle with points or a simple ECU, a tach/dwell is the easiest. Easy to find at garage sales, etc. Vacuum gage - really handy - totally worth it. Mityvac silverline also really handy and a good investment. With that you can figure out what the vac advance is doing. Timing Tape - Black with white or yellow numbering. Things thing s will help you. There's still a learning curve, but it takes a guy with tons of experience to do it by sight sound and smell. Even then, those guys will still use instruments to fine tune and write in their notebooks.
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Re: Problems with Hughes Whiplash cam in 383
[Re: Mattax]
#2480512
04/10/18 03:00 PM
04/10/18 03:00 PM
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Joined: Oct 2003
Posts: 11,684 W. Kentucky
justinp61
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I'd get it running with points. Each change made adds another variable. Find the reason its got no power. http://www.hughesengines.com/Index/produ...mp;partid=30172over 230* on a 383, it will want at least 16* initial and maybe up to 20*. Once that's done and off idle is OK, the rest of the curve can be corrected; either by moving the both spring perches out, and if needed by also shortening the slots. Depends on what the factory curve looks like to begin with. Tach - for idle with points or a simple ECU, a tach/dwell is the easiest. Easy to find at garage sales, etc. Vacuum gag e - really handy - totally worth it. Mityvac silverline also really handy and a good investment. With that you can figure out what the vac advance is doing. Timing Tape - Black with white or yellow numbering. Things thing s will help you. There's still a learning curve, but it takes a guy with tons of experience to do it by sight sound and smell. Even then, those guys will still use instruments to fine tune and write in their notebooks. ^^This^^ Start with the timing. As someone else posted I think the advance is ground into the Hughes cam, but verify where it is anyway. I also agree that the intake is not a good choice for this engine.
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480533
04/10/18 03:35 PM
04/10/18 03:35 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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master
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In his initial post he said he also tried the Carter AVS with this cam
He said it ran the same as the Holley
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480608
04/10/18 05:36 PM
04/10/18 05:36 PM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
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Initial timing... FBO sells a plate to limit the amount mechanical advance in the distributor so you can run a lot more initial ...the plate is pretty cheap. http://www.manciniracing.com/fbomodilipl.html
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480712
04/10/18 08:44 PM
04/10/18 08:44 PM
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Joined: Mar 2005
Posts: 1,406 New Jersey, USA
yella71
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Call me what ever you want... the reason I don't ask questions here is ive NEVER gotten a correct answer to anything ive asked. oh and you still don't know whats wrong do you? nor does anyone else, I told you what I would check so there you go good luck
Last edited by yella71; 04/10/18 08:46 PM.
71 challenger convertable, 64 sport fury 383 ci with factory air
99 sebring convertable
89 CTD pup
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2480900
04/11/18 02:10 AM
04/11/18 02:10 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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Aurora, Colorado
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What was done to freshen up the engine? Were the pistons replaced or heads milled? Just curious as the piston to valve clearance might be tight with 242 exhaust duration @ 0.050?
I think you said cam was installed straight up? So we really don't know the exact installed position? You could maybe just do a quick check that the intake valve is at max lift around 102-degrees ATDC?
I'd start with the basics, pull the plugs and inspect them, then do a compression check. Leak-down check if you have the equipment.
If that looks good, you do need to re-curve the distributor as mentioned earlier for maybe 18-20 degrees mechanical advance in the plate, and around 16-degrees initial timing at idle (with no vacuum advance.) Idle will likely need to be higher than normal too, and at idle the carb may be exposing the transition circuit. Check how much of the transition slots are exposed. You might have to drill the throttle blades if exposing to much of the transition circuit. Not sure if the drilled throttle blades is still the correct tuning adjustment? I think the Demon carbs have an adjustable idle air adjustment, and there may be a better way to correct that?
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Re: Problems with Hughes Whiplash cam in 383
[Re: Mattax]
#2480992
04/11/18 11:13 AM
04/11/18 11:13 AM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
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IMO the shortening the slots (whether by welding or using the FBO plate) is putting the cart before the horse. First see if changing the initial timing resolves some or all of the issue. Then see what the rest of the timing curve looks like. With that info, adjust the spring perches and/or the slots as needed. Agreed. Bumping the initial just to try it is free, quick and easy. I would play with that before spending money or going deeper.
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2481420
04/12/18 01:42 AM
04/12/18 01:42 AM
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Joined: Jan 2003
Posts: 1,908 Nebraska
4406bbl
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I did a 383 for a guy with that hughes cam, lifters, and springs, straight up, pistons a mile down, milled heads got it to 8.9 to 1 measured, pocket ported heads, old weiand dual plane, 100% stock older 3310, 18 degree in dizzy, 20 on the crank, exhaust manifolds and it runs fine. Its a bad combo but a bunch of old parts he wanted to use up, it sounds meaner than it runs, but will idle all day on cheap gas no matter how hot it is, which is what he wanted. Best advice all the initial timing you can get.
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2481634
04/12/18 02:07 PM
04/12/18 02:07 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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Freshening up consisted of new rings and bearings, gaskets and a valve job. The head surfaces were straight and flat, so surfacing was not needed. Pistons are a mile in the hole, so I'm not too worried about piston to valve clearance. I degreed the cam and it was installed to Hughes recomendations. I haven't been able to work on it for a week, because of the weather. Maybe soon, it is spring in Oregon! Sounds good, likely just need to work on the tune. Was asking because on my 383, I used the pistons that are at zero deck height and no valve reliefs, and the heads were milled. when I checked piston to valve clearance (smaller cam than yours) the clearance was closer than I thought it would be.
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2481687
04/12/18 03:47 PM
04/12/18 03:47 PM
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Joined: Apr 2012
Posts: 59 Florida
Sweet5ltr
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member
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First step, purchase a vacuum gauge. Give us the reading @ idle and while in gear.
Second step, add more initial timing.
Then let's go from there!
Hope you get it sorted out.
1969 Plymouth Road Runner (440 w/ Boost! RIP) now a low-deck 470 with hotchkis suspension, nascar boom tube exhaust, & big brakes.
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2482149
04/13/18 01:45 PM
04/13/18 01:45 PM
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Joined: Jan 2003
Posts: 20,733 A collage of whims
topside
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You could subtract 20 degrees of overlap Int & Exh and it would be a much better street cam. Especially with low CR. Ran an Engle in a 406" SB street motor - 214/224 @.050, .470/.504, 110 CL - and it ran great: perfect throttle response even with stock converter, 3.23 gear, 28" tire, handled AC, pulled 17 MPG, but still sounded pretty rumpity. Rarely have I seen a street car where the rumpity idle was the main build consideration actually run well @ lower RPMs. I scaled that SB Engle up 1 lobe spec Int/Exh for a 446" RB street build, and got the same results in a 4-speed early-B wagon.
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Re: Problems with Hughes Whiplash cam in 383
[Re: elmor353]
#2482388
04/14/18 12:33 AM
04/14/18 12:33 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
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my speed shop said now way with stock everything..LOL!
750cfm eldelbrock holley street dominator 440 whiplash cam/springs headers-3" pipes/muffs 12" low stall TC 727 used 2.76 3.23 3.91 gears turning a 29x15x15 m/t all street friendly
dist locked 0* 36* total
I drive it daily/weekends and have clocke 10,000 miles now. great daily drive if you got gas $$
Last edited by scratchnfotraction; 04/14/18 12:37 AM.
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