CLASS RACER FORUM - new combo missing a bunch of power?

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Re: new combo missing a bunch of power?

Quote:

Originally Posted by randy wilson (Post 534870)

The msd either runs, or it don't. Just my experience. I take it you don't have a crank trigger? The pickup will lose that much if bad, and still run.

I had this happen to me with the pickup. The car slowed down and was laboring. I thought I hurt the engine. Pulled it down and did a freshen up. The engine was perfect when we took it apart. When I went to start the car after the engine was back in and it would not start. Turned out the pick up was bad on the crank trigger. Changed that out and the car started right up.

Re: new combo missing a bunch of power?

We had the same thing happen on our 705, motor would not run like it should it was laboring and it was a crank trigger.

Re: new combo missing a bunch of power?

NO crank trigger, the battery is pretty old now that i think of it um something else to try would that cause an issue even with a alternator putting out the required voltage? the Distributor is dated could the pick up in it be getting weak?

Re: new combo missing a bunch of power?

To save time,parts, and money I would pull the engine and put it on the dyno. You will find out real quick if its the engine or the car.

Re: new combo missing a bunch of power?

You have a PM

Jim Mantle

Quote:

Originally Posted by pfordamx (Post 534737)

So after a major overhaul, our car starts and ideals and does everything well its just way down on power. and i was wondering if you guys could give some ideas on where to look. the car is 1969 amx with a 427inch amc stroker 13.1 compression .740 and .760 lift solid roller duration is 278 and 284 @ .050 108 lobe separation installed at 104.5. Hemi Adkins did the heads they flow 305 @ .700 on a stingy bench. it weighs 3264 with me in it its got 727 torque flight with a brake and a turbo action 8 inch converter that should stall at 5900 and 28 inch tires and 4.10 gears and spool. the rear suspension is all calvert stuff. i don't think the lack is in the chassis or transmission because the car is ok in the 60ft if it was down 300hp becuase it went 12.00 at 106 with 1.51 60ft lifting the wheels about 6 inches. i've thought it could be in the converter. it just does not pull like it should, the motor hasn't been dynoed but i would think it should make 600hp. when its right i wondered about valve springs but if that was the case it would hit a rpm wall right? i'm open to any and all ideas. The things i've considered that could be wrong are

The plug wires are over 5 years old those will be changed soon.
I'm curious about our digital 6 thinking about having it tested
its 1000cfm e85 carb we have a gas dominator we intend to test in its place. the timing is locked at 38 and has been checked repeatedly. that setting might be a little soft alot of amc's like 40 but it shouldn't make 2 seconds worth of difference. the fuel system is overkill magnafuel 500 pump and regulator and -10 line holds 6.5psi with out flinching. i'm kinda at a loss any help is appreciated

Thank you
Patrick Ford

Re: new combo missing a bunch of power?

Quote:

Originally Posted by jmantle (Post 534897)

You have a PM

Jim Mantle

you have a reply.

thank you.

Re: new combo missing a bunch of power?

REREAD POST # 7 and #34.Go directly to an ENGINE DYNO and you will SAVE a lot of MONEY misspent on changing parts and trips to the race track.Bill C.

Re: new combo missing a bunch of power?

Quote:

Originally Posted by CFMCNC (Post 534964)

REREAD POST # 7 and #34.Go directly to an ENGINE DYNO and you will SAVE a lot of MONEY misspent on changing parts and trips to the race track.Bill C.

And post #27

Re: new combo missing a bunch of power?

Guys, I would imagine you don't walk into any dyno facility with an AMC motor, and everything hooks right up. Block, headers, etc.
Also ,this is a bracket deal, and he's already spent a bunch on it.
It may turn out that dyno-ing it would have saved him money in the long run, but maybe he prefers to spend it in smaller increments.
That's why he's here, asking questions, I would guess.

Re: new combo missing a bunch of power?

Mark is right at this point were going to try exchanging some parts we already have and see what it does if nothing changes. the engine will probably come back out and well find a dyno that can accommodate an amc somewhere. i still haven't rulled out the converter hopefully well get some answers this weekend. I do have access to a hub dyno but that still leaves alot of variable since the car would be part of the equation.