Re: TF270 accessories
[Re: fast68plymouth]
#2705833
10/11/19 10:52 AM
10/11/19 10:52 AM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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I have to switch from + mode to mode for my own sanity. Got enough problem sticking to my own plan, much less helping others figure sh!t out.
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Re: TF270 accessories
[Re: mopar dave]
#2705840
10/11/19 11:09 AM
10/11/19 11:09 AM
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Joined: Jan 2003
Posts: 4,041 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,041
Shelby Twp. Mi
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... I called Best Machine today and spoke with Chuck about it... They have a reputable dyno and knowledge which would be a VALUABLE tool for you at this point. IMO you have been given good advice by some of the best but, as has been said 'it's your project'.
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Re: TF270 accessories
[Re: mopar dave]
#2705842
10/11/19 11:13 AM
10/11/19 11:13 AM
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Joined: Aug 2011
Posts: 2,853 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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Double, triple, quadruple check that you are getting WOT !!!
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: TF270 accessories
[Re: mopar dave]
#2706024
10/11/19 07:46 PM
10/11/19 07:46 PM
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Joined: May 2004
Posts: 12,383 Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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That's seems to be what i'm getting from most here. I think the most economical way would be to go in baby steps here and get a few springs checked, then back to the track for some driving techniques like short shifting for one. Try some timing loops and play with jetting. This combo should work. Although I thought I played with the timing and jetting enough, but maybe not from what i'm hearing now. Dave, It takes time. I have been developing my combo since 2012....Lets talk about yours and see where you think its missing....Right off the bat, your thinking its the heads....Lots of things to check there....Valve springs.....Most over looked aspect of the heads. Pull a couple, check them.....Bent valve causes all kinds of issues....What have you checked and What does it drive like?
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Re: TF270 accessories
[Re: mopar dave]
#2706067
10/11/19 10:56 PM
10/11/19 10:56 PM
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Joined: Apr 2007
Posts: 871 WA 98043
thecarfarmer
super stock
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super stock
Joined: Apr 2007
Posts: 871
WA 98043
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If going from 34° to 36° didn't gain anything, I would be surprised if adding more total advance got you anywhere. Also, has true TDC been verified against the marks on the balancer; does the ignition system have any curve, or is it locked out?
How does the plugs look, from cylinder to cylinder?
Also, since the cam is fairly generous, compared to the CR, what fuel is being run in the car? Sometimes, some combos actually run a little better with a lower octane rated fuel. Not saying it's the case here, just something to consider.
If you have plenty of valve 2 piston clearance, how about advancing the cam some? Getting that intake valve closed earlier might help build a little more pressure, especially at lower speeds. If the combo likes that, and a little extra valve lash... Fairly cheap to try, just a couple of gaskets.
Also, tried launching @ 3000? If it liked 2500 > 2000...
I realize the OP may have tried any or all of these things, just trying to throw some cheap and easy things to try and check out there.
Seduce the attractive, and charm the rest.
******
489 C.I.D., roller cam, aftermarket heads, tunnel ram, stock '54 Dodge rear axle assembly: which of these doesn't belong?
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Re: TF270 accessories
[Re: fbs63]
#2706240
10/12/19 05:14 PM
10/12/19 05:14 PM
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Joined: Jan 2007
Posts: 8,031 Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
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I'm not sure where it wants to be shifted. I just went for what might be my last blast in it for this year. Sure is a fun car to drive on the street, I will say that. no dips or sags or stumbles, It runs very good on the street. If ya didn't know better, you would think it had a 4150 on it. Very good street manners in my opinion. I was just out running it up to 7000 thru the gears, seems like it runs out 66 or 6700. Really hard to tell, but it is done at 69 to 7000. It might be worth it just to get on a chassis dyno and find peak torque and best timing. I currently have the timing at 37* total and I leaned to carb down a bit, but its still at 11.7AFR WO with the fuel I just put in it. Needed to get rid of what was left of the race fuel for the season. With straight pump gas its usually around 12.5 WO throttle. My thought right now is that the timing is very close at 36-37*, just by looking at the plug, watching vacuum and listening to it, driving it and a bit of track time. The carb could use a little time I think on the pvcr's as the specs show more fuel in the front than rear. .067pvcr 82 jet front and 88 rear. I need to get my carb book out to see what is equivalent in pvcr to 6 jet sizes. It went thru traps at 6900 RPM
Last edited by mopar dave; 10/12/19 05:18 PM.
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Re: TF270 accessories
[Re: mopar dave]
#2706562
10/13/19 11:36 PM
10/13/19 11:36 PM
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Joined: Sep 2012
Posts: 6 Canada
MestocX
member
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member
Joined: Sep 2012
Posts: 6
Canada
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Not sure if this helps but will tell my story first combination B block 400 499' 4.150 stroke 13.1 compression Cam motion 283 Duration 704. 660 -2 retarded roller Isky redzones 2 inch fendwell Hughes Max Wedge Victors 333cc first editionnot the monster max indy 4150 intake cast with 2 inch spacer with 1050 4150QF 40 degrees timing on engine dyno 724 at 6800 650 at 5200
Car 67 Barracuda 14.32 tire 456 dana Glide with 1.96 6000vert Weight 2762 w/ driver Changed from 4150 to 1100cfm 3 circuit Dommy (pro systems) 35 degrees timing License pass 9.68 at 136.56 mph At 3000ft Needless to say was not impressed with the performance but over the years tweaked the motor *went from 35 degrees to 40 degrees. New best 9.61 @138 mph * went from mineral oil to synthetic New best 9.55 at 139mph
Next race season Switched to indy 4500 intake w/ plenum modded from ebay (lol) Hvh super sucker cloverleaf 2 inch *timing at 35 degrees (mistake lol) New best 9.50 at 142.3 mph
Same year found a used holley ultra dom 2 circuit 1150 from holley Carb to carb swap New best 9.41 at 143.32 mph
1.96 glide gear broke (dang)
New 1.80 gear set
New slow e.t 9.51 at 142.3 Timing from 35 degrees to 42 degrees New returning best: 9.43 at 142.6
Following race season
Added 3.5 inch collector extensions Built airpan seal to hood Hvh cloverleaf to a regular 2inch super sucker Slight porting of intake runners +port match New best 9.33 at 143 mph
Next year
Went to a BTE 1.98 gearset New et best 9.23 at 144mph
ets recorded around 3000ft for comparison reasons
Sometimes you just have to tune what you got and work the car around the combo. 1 freshening same exact long block.
With tuning guessing engine makes 750-770 hp 650t shift at 7200 first/drive
Having a camera man + go pro + afr gauge helps with tuning. Having more eyes than your own is your greatest ally.
Lady driven. It's my mother. Me and the ol'man are the pit bitches.
(Knowledge from Moparts members greatly assisted with the progression of the car.)
Thank you. Ryan
Last edited by MestocX; 10/14/19 02:45 AM.
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Re: TF270 accessories
[Re: MestocX]
#2706582
10/14/19 01:54 AM
10/14/19 01:54 AM
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Joined: Aug 2003
Posts: 43,123 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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Why is that cam retarded 4 degrees? Is it installed at 4 degrees further away from TDC on the intake lobe center than the exhaust lobe is? What lobe separation angle is this cam ground on and where is the intake lobe center installed now ?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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