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My fancy B20 is busy heaping huge piles of hate all over my garage...and I'm getting a little sick of it. I'm trying to get the thing to run correctly so I can make it from Alberta to the IPD garage sale in May in Portland. Time is now officially getting tight as I've got a pretty full slate at work until I leave. I've had the HIF's on and off the car so many times that my proficiency with that part of the job is way more advanced that it should be.
So to recap the problem. This is my fancy B20 with a VPD head (big valves, dual springs etc), VPD street performance cam, H-beam rods, fancy forged pistons, and the much dreaded HIF's. I've been having carb related problems ever since I put them on the car. My B18 had HS's and they were simple to maintain and tune. The HIF's were treated to a full rebuild including new jets, needles (BB) and every gasket, spring etc was tossed for new parts.
I've got the fuel bowl level set to 1 mm above the carb body (measured at the "scoop" using two dimes and a straight edge). New needle valves (the hard rubber tipped ones - stock SU parts from Rhys). Last time I posted about this these carbs were puking fuel everywhere so I had to put on a fuel pressure regulator - adjusted to 2 psi.
Here's the problem, I can't get these HIF's to tune for love nor money. Here's my basic procedure - first up get the thing to idle and make sure it is warm (enriching device works). Then I set the idle balance using my Uni-Syn and check the mixture using the lift pins. At the factory setting (2.5 turns down on the jet), when I lift the pins, both carbs are stumbling => lean. So I turn the jets down another 0.5 turn until the stumble goes away (they are now full rich).
Set this way, the car will diesel (still) and when running, will surge at idle to 2500 rpm! Not exactly drivable! I do blip the throttle between changes and take it out for a spin from time to time to clear it out.
Now, this may be related to the dieseling, but tonight I noticed that the cam gear (steel set) sounds like it is rattling around. It was torqued to the correct setting, but I fear that it has come loose from running on.
At this point, I'm at the end of my rope. These HIF's are about to get reduced to AL scrap with a very big hammer...
Here's a picture of what should be a very good engine. By the way, the fuel line is now plumbed in the stock location by the thermostat housing to avoid vapour lock.
Help,
Craig
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