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Old 02-11-2004, 08:46 PM
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Engine lacks alot of power.....any help?

I`ll try to get right to the point. This engine combo ran a 15 second 1/4 mile. It`s not my driving. With the parts I am highly dis-appointed. I think my duration might be too big or lack of compression for this combo might be the problem. What do you guys think?? Here`s the combo/parts. I am prepared to pull it out and start over, what part does not fit? What would you change?

86 trans am
3200 lbs
3:73 rear posi
355 ci
forged flat top piston, 4 valve relief
9:7.1 CR
compression test all cylinders between 161 and 169
Edelbrock rpm heads
Edelbrock 750 manual carb and air cleaner 14*3
Edelbrock performer intake
comp extreme cam 274
duration @ .050 is 230/234
with 1.6 rockers lifts at .532
700r4 tranny
Holley fuel pum ( mechanical )
Pertronix distributor

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Old 02-11-2004, 08:55 PM
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I would look at that 700R4 trans, that may be slowing you down.
how old is it? any new parts in it?
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Old 02-11-2004, 08:57 PM
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Im running a similar combo to that except in 383 form and slightly higher Compression. I think your setup is pretty well rounded, maybe want an rpm intake. I think you have a tuning issue. Maybe check carb, timing, valve adjustment, etc. That should run pretty good. I would suspect that combo will run better than 15 flat when tuned right.

What do you have for a stall convertor? I would use at least a 2500-2800.
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Old 02-11-2004, 09:00 PM
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i agree i think its a tuning problem what is the rpm range on that cam and intake and what stall do you have??
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Old 02-11-2004, 09:03 PM
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What converter are you running? what is the 60 foot time?
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Old 02-11-2004, 09:05 PM
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What good is engine performance if his tranny is hashed?
or his posi-track is worn out?
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Old 02-11-2004, 09:08 PM
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stall converter is probably shot, your motor is fine, don't pull it. Check fuel pressure and ignition. Your carb is too big and you'd be better off with an RPM manifold. BTW, what kind of headers are u running, what kind of exhaust? Your cam needs some nice exhaust.

K
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Old 02-11-2004, 09:13 PM
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You didn't mention what you are running for an exhaust system. A restrictive exhaust system will rob your power quicker than most anything.
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Old 02-11-2004, 09:20 PM
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2400 B&M stall...brand new

rear end ...fresh 373`s

Hedman shortie headers to Y-pipe than to a cherry bomb ( That was my next project) \


trannys old. 1986 stock. I was wondering about this, robbing power.

R/T was... .859
60 was 2.28

I still got the stock tiress on 215/65/15.....I know.

Thanks guys. Whats going on here?
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Old 02-11-2004, 09:22 PM
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the cherry bomb is restricting your exhaust that should be the first thing to go
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Old 02-11-2004, 09:25 PM
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Ditch the bombs, cut the y and junk the 700R and put a TH350 in there. You shoudl be running in the 14's, maybe 13's with that setup at that weight.

K
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Old 02-11-2004, 09:42 PM
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im running a similar set up
79 camaro 3400 lbs
355
9.7:1 compression
world S/R torquers
comp 268 extreme energy 224 230 .477 .480
weiand stealth intake
speed demon 650
14 x 3 K&N X stream
cowl induction
3.7:1 open diff ford 9 in
and the topper bridgestone 235 75 15 truck tires ( got em free the day i had to race, ford rims needed 15's i had only put the axle in the day before. will fix that one next)
stock th 350 stock stall ( going to borgwarner t 10)
and im running 14.5 with lots of tire spin,
im putting in total seal rings and later going to manual and full roller valve train, just have harland sharp 1.5's now.
id say you have a tranny- tuning problem. ps ditch the cherry bomb that might be killing the whole thing. im running purple hornies right off full length headers and they angle out the sides. still not the best but at 3in straight thru they will do. what rpm are you shifting at? that has a rather high power band make sure you wind it up to your peak power. my 60 ft was 2.25 what was your 330 ft speed and mid track speed. does it use all the fuel you give it or does it bog a bit under the mech sec?
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Old 02-12-2004, 05:44 AM
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if you like the 700r4 then there are alot of aftermarket upgrades for these, i've seen aloyt of parts for these but if you want to add a little extra jump to it then install corvette servo's in it, should help your 60 foot time as well as top end, i think there is a racing servo and valve body as well as pumps i think its called a raptor? anybody else heard of these i cant think of the website i saw them on..hope this helps
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Old 02-12-2004, 06:57 AM
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You have a mismatch with the intake for one thing. The performer is only good till 5500 at best. An RPM intake would work best with your combo. Get a flowmaster or dyno max or equivilent. What is your tune up-timing, have you tuned the carb, what is your fuel pressure at shift points. I bought 2 new holleys that were internally regulated to 7.5 psi and actually put out 15 psi. There is always the possibility that its not putting out enough pressure. It could be the trans but I would think it would be slipping or be showing some sort of symptom.

Steve
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Old 02-12-2004, 07:34 AM
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So that servo can hold back power also? What does the servo do anyway?
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