PUZZLER!!! My new motors a dog! what did I miss?

[fishmens67]

you sure the brakes are adjusted properly . nothing seems to far out of wack for foothill altitude

 

[mbaird]

1800 is an understatement because I can cruise down the freeway at 3400 and it runs nice...but it doesn't take much horse power to cruise.

 

[nm9stheham]

Used them....Eddie ran better. Engine runs good to about 1800 but goes flat after that....just runs like a low power 318...seems to have trouble breathing up higher..

Going flat at 1800 could just be where the torque converter is trying to stall with whatever torque the engine is producing, and the engine is then starting to see a real load on it and bogs down.

With a retarded cam, the exhaust will be open too late and can easily dilute the intake charge (like an EGR system) and that might cause the mixture problems. So a timing re-check seems in order. (It is soooo easy to do something wrong in that process if you don't write everything down. I'm pretty good with it but if I don't write it all down, and then crunch the numbers on it all, I can fool myself.)

 

[fishmens67]

it will run great with a cam to far advanced, just won't rev or make power.

 

[draginmopars]

how much vacuum is the engine making
if low, check ignition timing
if still low, re-check cam to crank timing

 

[AJ/FormS]

From post #1 vacuum is 15/16
From post #1 timing is 20/36
From post #7 I corrected the dampened for tdc...
I actually checked the cam degree with wheel and dial indicator....doesn't mean I didn't make a mistake......I have thought about the secondaries opening on Eddie...but I know my Holley DP was opening...and it ran sluggish with it...
From post #22 I have all the propped tools for degreeing...cam came out to Lunatis recomendation. ....doesn't mean I didn't have senior moment.

 

[greenswinger]

Leaking intake or carb gaskets for lean condition???

 

[mbaird]

Brakes are 73discs upfront/Jeep discs out back and I can push the car around so they aren't dragging.

A/J is right this thing should smoke the tires (205/70r14s BTW)
Trany is a 904 with 2500 stall (supposedly) and TF2 shift kit ...had it Behring my W2 .638 roller engine . Don't think that's the problem.

I'm sure it's the cam install....just wanted input before I tear it apart. I have named this car my " 2nd Job"... Lol. 1st motor ate a baseplate screw out of my a Holley....Urghh....
Try and diagnose a random Doinking sound! A tiny Phillips Philster head screw migrating from one cylinder to another hitting the bottom of a LD340!

 

[mbaird]

From post #1 vacuum is 15/16
From post #1 timing is 20/36
From post #7 I corrected the dampened for tdc...
I actually checked the cam degree with wheel and dial indicator....doesn't mean I didn't make a mistake......I have thought about the secondaries opening on Eddie...but I know my Holley DP was opening...and it ran sluggish with it...
From post #22 I have all the propped tools for degreeing...cam came out to Lunatis recomendation. ....doesn't mean I didn't have senior moment.

Yes....I have tried to be methodical about this.
But I have to assume I made a mistake or a had a brainfart checking the install.
As for the Eddie secondaries ...that would explain WOT but not the tip in power this motor should have. And I have to admit I am not as familiar with Eddies as I am with Holley's

It's that persists ant lean condition that has me boggled....I will try the Holley again before tearing into cam.

 

[mbaird]

Leaking intake or carb gaskets for lean condition???

Considered that.

I chocked off the carb with my hands and it died immediately.

 

[greenswinger]

weird, she oughta run strong I'd think. My combo is similar to yours but with a chinagap intake and summit 750 carb and much ported 596 heads with 2.02/1.60s. With 273 gears (for now) it pulls like a freight train. Mutha thumpr cam too

 

[Inertia]

Unhook the headers,, then take it for a blast,,

Eliminate exhaust restriction.. ??

 

[greenswinger]

My gut (for what that's worth haha) suspects timing. I fought mine a bit until I figured out my distributor vacuum advance was leaking.... bout pulled my hair out. That combo should make good torque. Any detonation? Pinging under acceleration??

 

[mbaird]

Vacuum advance will effect driveabilty . It doesn't really come into play here.
Hooked up or not it doesn't make much of a difference . I have to get the power side figured out first.
I'll yank the front off this weekend and redegree the cam.

I really can spell!! It's this damn spell-UNCHECK on my iPad..

 

[mbaird]

Leaking intake or carb gaskets for lean condition???

Considered that.

I chocked off the carb with my hands and it died immediately.

 

[Woodys cudas]

Are you possibly running with too much valve spring pressure. But my first thought would be cam timing. Also... Don't forget to add the zinc additive to your oil with flat tappets.

 

[moper]

"The cylinder pressures are fair to middlin'; SCR should be in the low to mid 9 range with this piston/head combo. I would expect maybe 150-160 psi? Being low could mean a later intake closing.... could be from a cam retarded 1 tooth. Proper degreeing should catch that but it sounds like the OP is not confident."

Exactly where I was going with my comments.

 

[AJ/FormS]

Post#31 was a poke at Post#30, who,it seemed, had missed them.

 

[furyus2]

I may have missed it, but is it a flat tappet cam? Might be going flat. You said it's lean with no power. Could you have left rags in the ports when assembling? It's been done before. Might want to pull the intake.

 

[mbaird]

Post#31 was a poke at Post#30, who,it seemed, had missed them.

Ah......
I didn't take offense. Just didn't understand.....


I think it has to be a cam timing issue.

I must have installed it spot on to the WRONG number.
I remember checking it twice and thinking I was lucky to have it come out correctly
on initial install

 

[mbaird]

BTW, no beer was involved in assembly .....lol

 

[64physhy]

BTW, no beer was involved in assembly .....lol

There's your problem. Should have said that in the first place.

 

[mbaird]

Well maybe just 1

And that was the problem!

 

[Divenut]

well maybe just 1

and that was the problem!

lol :d

 

[dano]

Define "good springs"? Do they meet Lunati's requirement?

Have you checked for vacuum leaks? I got 16" out of my 268 Voodoo, I'd thin a 262 should pull around 18"ish?

What method did you use to degree the cam?