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« on: June 27, 2019, 07:55:06 AM »
So, last week I slapped on a vintage Weiand TR with two 750 DP's (Bought them as a package deal) I've rebuilt the carbs and everything seems to be good on those. Running 74/75 on the jets with 50CC pumps at both ends and no power valves.
I'm running a Mallory ign. module in an old points dist. The ignition seems strong, strong enough that I backfired and blew the top plate gasket out of the TR.
The motor is a '78 454 out of a truck, stock cam. I put 781 heads on it at the same time, those are good to go. I'm also running OT Bassetts.
My question is: Am I over carb'd? The plugs are a little wet, but I attribute that to pumping the carbs to get it to fire and then it not running long enough to burn everything off. I can't get this thing to idle at all, it revs to ~2500 then coughs and sputters a bit and dies. I can fiddle with the throttle and keep it half-assed alive, but it's not happy. A little poppy through the pipes, The timing isn't perfect, but I've gotten it kind of in the middle of too advanced/too retarded.
I'm thinking that I might have a vaccuum leak causing this, the mid piece on the TR isn't as flat as I think it should be where it mates to the top plate. I can see light under a straight edge on one side of the TR. I'm going to sand the plate this weekend and see if I can true it up. The way the gasket blew out of it makes me think that it isn't sealing as well as it should.
Also, how flat does the carb base plate have to be? The perimeter is flat/true, but on an angle there is ~.005 gap at the middle of the carb. It's like the ears have been a little too tight, but like I say, the perimeter isn't leaking, so I figure this little bit of gap shouldn't matter on a squarebore.
Long story short, engines revs high real quickly, then dies out and won't idle even when fiddling with the throttles. Too much carb or a massive vaccuum leak?
Thanks in advance.