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Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770511
08/10/10 02:36 PM
08/10/10 02:36 PM
Joined: Jan 2003
Posts: 13,376
Marion, South Carolina [><]
an8sec70cuda Offline
I Live Here
an8sec70cuda  Offline
I Live Here

Joined: Jan 2003
Posts: 13,376
Marion, South Carolina [><]
Quote:

OK, so I guess I have two choices then concerning the engine..

1. Keep it at stock stroke but use a high .750 lift roller cam and high stall converter to get the use of flow and power from what the heads can make..

Or...

2. Build a 540 cubic inch stroker bottom end and supercharge it and with that I could use the hyd. roller cam and may be even the Dynamic 9½ converter I have in the trans now...



/Tom



Just a converter change will likely get you right where you want to be.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770512
08/10/10 02:40 PM
08/10/10 02:40 PM
Joined: May 2004
Posts: 952
Stockholm, Sweden
MrSixpack Offline
super stock
MrSixpack  Offline
super stock

Joined: May 2004
Posts: 952
Stockholm, Sweden
Or you and I can switch heads, mine are brand new never assemblied.
New valves, springs, retainers etc.

Then your old heads can find there way back in to my challenger once more


1970 Super Stock Challenger ex. Paul Rossi
1968 Dodge Dart GT 340
1968 Dodge Charger /6 3 speed manual
1966 Chrysler 300 Loaded
1968 Dodge Charger R/T 440

1968 Mini Cooper
Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770513
08/10/10 07:04 PM
08/10/10 07:04 PM
Joined: Feb 2007
Posts: 2,578
sweden
1
1Fast340 Offline
master
1Fast340  Offline
master
1

Joined: Feb 2007
Posts: 2,578
sweden
Tom i saw you car at the track im sure i didnt see all your runs but the few i saw on saturday it looked like the car wasnt hooking up to good and maybe some shiftertrouble also if that helps you troubleshoot.
im not an expert of anykind and im not very good at judging how a heavy dragradial car on leafsprings hooks after to much looking at my friends light nova on ET streets wich has fairly good 60´s
very nice seing your car at the track finaly
i know how long you have been working to get there,and im sure you will get it all sorted out with some time and patience

Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770514
08/18/10 05:00 PM
08/18/10 05:00 PM
Joined: Sep 2007
Posts: 258
Stockholm, Sweden
T
TomsCharger70 Offline OP
enthusiast
TomsCharger70  Offline OP
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Joined: Sep 2007
Posts: 258
Stockholm, Sweden
Little update...

Checked what rpm on the converter stalls at. I got it up to about 3500Rpm before the rear tires got grip and started to push the car forward (3rd gear).. is this to low for the engine setup Im running???

Another problem: The engine also seems to "Bog" when I hit the throttle hard. Also a probable reason why my ET is not where it should be..

To cure the "bog" -Would a larger size squirter help? I dont want to change to many things at once... remeber Im a Noob!

Thanks

/Tom

Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770515
08/18/10 05:05 PM
08/18/10 05:05 PM
Joined: Jan 2003
Posts: 13,376
Marion, South Carolina [><]
an8sec70cuda Offline
I Live Here
an8sec70cuda  Offline
I Live Here

Joined: Jan 2003
Posts: 13,376
Marion, South Carolina [><]
That's not the stall. Put it in 3rd gear, get rolling at about 10 mph, mash the throttle wide open quickly and see what the tach jumps to. Do not hold it wide open, just a quick stab to see where the RPM flashes to. That will be your flash stall.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: My Hemi seems to be way down on power -Help!!! [Re: an8sec70cuda] #770516
08/18/10 05:08 PM
08/18/10 05:08 PM
Joined: Sep 2007
Posts: 258
Stockholm, Sweden
T
TomsCharger70 Offline OP
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TomsCharger70  Offline OP
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Joined: Sep 2007
Posts: 258
Stockholm, Sweden
Quote:

That's not the stall. Put it in 3rd gear, get rolling at about 10 mph, mash the throttle wide open quickly and see what the tach jumps to. Do not hold it wide open, just a quick stab to see where the RPM flashes to. That will be your flash stall.




I just realised that I did it wrong Need to try it again...

/Tom

Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770517
08/18/10 05:10 PM
08/18/10 05:10 PM
Joined: Sep 2007
Posts: 258
Stockholm, Sweden
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TomsCharger70 Offline OP
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Stockholm, Sweden
..But problem is that the engine wants to "Bog" when I really mash the trottle hard.. so I need to fix that issue first...

/Tom

Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770518
08/19/10 05:43 PM
08/19/10 05:43 PM
Joined: Sep 2007
Posts: 258
Stockholm, Sweden
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TomsCharger70 Offline OP
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TomsCharger70  Offline OP
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Stockholm, Sweden
Tried it again today, the converter flashes to 4500Rpm, seems OK for the combo, right?

I wonder if the problem why my ride wont run the time slip it should, well not taking into account the driver -Me, is the carburetor...

There is a serious "bog" when I hit the throttle hard. I changed squirters to the largest I have (QF # 55).. Seems that the acc. pump shot is just not enough.. The bog is really bad when rolling and hitting the throttle hard. The A/F gauge went up to 22.5 thats like leaner than He..ll.. From a stand still and if I ease into it kinda carefully, it will not bog, but easing in on the throttle when dragracing kinda goes against the whole idea of dragracing... Tried to brake it against the converter, but the tarmac was just to slippery, so the front wheels just started to slide, and when the front tires would hold, then the rear tires would just spinn with out traction...

May be going up in main and secondary jet would help, but then again that would just suck, cause the engine is already running fat.. if I run it even more, then birds will start to drop down from the sky if they fly over my ride... Ooh, and I run my engine on E85, but tuning the carb and trying to get rid of issues should still be about the same..




/Tom

Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770519
08/19/10 06:53 PM
08/19/10 06:53 PM
Joined: Nov 2004
Posts: 2,825
Sk. Canada
RemCharger Offline
master
RemCharger  Offline
master

Joined: Nov 2004
Posts: 2,825
Sk. Canada
Need new accel pumps? Are you running open exhaust? You may benefit from a good long collector. I picked up consistant 2 tenths, on my big headed, big cammed, 383.

Re: My Hemi seems to be way down on power -Help!!! [Re: TomsCharger70] #770520
08/20/10 01:35 PM
08/20/10 01:35 PM
Joined: Feb 2007
Posts: 2,578
sweden
1
1Fast340 Offline
master
1Fast340  Offline
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Joined: Feb 2007
Posts: 2,578
sweden
have you checked that you realy get a pumpshot from the accpump? so its not just some crap stuck in it,also have yóu checked that you actualy get fuel to the accpumpwell? im thinking your not getting the fuel there..

that explains it atleast from what i saw at kjula i just thought you had a shifter problem or something other strange since i couldnt here what or if your engine did anything at the startingline with all the other cars beeing so much louder,that hemi is very quiet

Re: My Hemi seems to be way down on power -Help!!! [Re: 1Fast340] #770521
08/26/10 11:44 PM
08/26/10 11:44 PM
Joined: Sep 2007
Posts: 258
Stockholm, Sweden
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TomsCharger70 Offline OP
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Stockholm, Sweden
Quote:

have you checked that you realy get a pumpshot from the accpump? so its not just some crap stuck in it,also have yóu checked that you actualy get fuel to the accpumpwell? im thinking your not getting the fuel there..

that explains it atleast from what i saw at kjula i just thought you had a shifter problem or something other strange since i couldnt here what or if your engine did anything at the startingline with all the other cars beeing so much louder,that hemi is very quiet




No problems with the pump shoot, checked and tested... The shifter "problem" was not really any problem at al, it was just me messing about and acting like a compleat dork...

-Yes, the sound my Hemi makes, is to quiet.. The only way I know my engine is running in the stageing lane is to check the Rpm gauge.. Need to change out the Super Turbo mufflers, they are way to quiet...


..any ways... Went back to the Race track last weekend and I GOT MY 11sec TIME SLIP..

Reaction: 0.37
60foot: 1.77
1/8 speed: 92.5mph
1/8 time: 7.68
1/4 speed: 118mph
1/4 time: 11.91

I did some change in the carb setup. I changed out the squirter to the largest one I found, a squirter # 63. I also checked the engine timing and to my suprise it was only 30*, I raised it up to 36*

The carb "bog" is still there, though not as bad.. I also found out that if I ran the engine against the brakes and got the Rpm to about 2500 then it did not "bog"..

I also guess one reason for the "bad" 60 foot times is the rear tires, they are old and even though not used, I guess they lost some of that good grip they initially had.. so there is definately an issue with tire grip...

On a positive note, the top end Mph is higher this time around than the first. It went up from about 116mph to 118mph.. So the engine definately has to power to go mid 11sec times. I just need to get the car to 60foot better... My reactions times are also much better.. Actually on that 11.91sec run, my reaction time was the slowest of al 5 runs I did that day... The two runs before and two runs after, were just a hair over 12sec.



/Tom

Re: My Hemi seems to be way down on power -Help!!! Update.. [Re: TomsCharger70] #770522
08/27/10 01:59 AM
08/27/10 01:59 AM
Joined: Jan 2005
Posts: 58
Oak Lawn IL.
K
kosdart1 Offline
member
kosdart1  Offline
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K

Joined: Jan 2005
Posts: 58
Oak Lawn IL.
I think you should put the old cam back in the engine...The new cam you have is killing the engine..the 119 ex.C/L for one,and if you are running stock rockers,you need the check the lift at the intake valve........Stock intake rockers lose about .100 lift.......you are chocking the intake side for flow,,and over scavaging what little fuel thats getting in there,,,,Yes I know the car is heavy,,,But I would try the old cam,,You have,,no cost to try this.....Hope this helps.....

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