Diagnostic help ..
 

Hey guys, Kinda of a long winded story, but Ill try to keep it short..
I have a late style Merc engine, It runs great, so I couldnt help mess with it,
It had a Finton 2 carb intake with a alternator, with 2 Holly 2110s,
Stock cam, Mallory Unilite, and a MDS 6200 series box.
Well I put a 400Jr cam and a Eddie Meyer intake on it.
Isky single spring, springs and adjustable lifters, and changed the alternator to a generator .
If you drive the car under 28 to 3k RPM it feels great, but right around 3k it acts like its hitting a rev limiter .
I rebuilt both carbs and have the fuel pressure set to 5 pis .
First I thought the coil was breaking down, so I changed it, same thing.
Then I disconnected the MSD box, and the unilite, and stuck one of Jims distributors in, same thing, battery is good.
I actualy spoke with Mr Iskenderian and he said the 400Jr should work with his single spring set.
Im thinking the valves are floating, I dont know what the valve seat pressure is, not sure how to check on a flathead.
I feel certin its not the ignition or fuel, what else could it be ? Valves floating ?
Thanks ...

Re: Diagnostic help ..
 

Sounds like restricted fuel flow during high demand.

Lonnie

Re: Diagnostic help ..
 

If it was fuel pulling the choke would make a difference...and cruising with a light foot on the pedal would take you right by the 3k limit if accelerating works fine up to that point.
Measure the installed lenght of the valvespring that will give you a hint if you have an issue there.

Re: Diagnostic help ..
 

Thanks for the help guys, Ill try easing past the 3k range again, and as far as the fuel goes, there are no choke plates on either carb, and what makes me wonder, is I have a dry gauge on the fire wall mounted fuel block, and sitting at idle its at 5 psi, but when I rev it it shakes all around, makes me wonder if there is sufficient fuel at 3k or its just a junk speedway gauge ...
to make things even worst something went pop in the bell housing and the clutch isent working, lol, so now I gotta pull the trannie and fix that befroe I can go any further ...