Author Topic: My Leak down test was ok (Read 2715 times)

pantera1975 · « **on:** July 23, 2013, 10:11:00 PM »

I did a leak down test on my ESR 330 held 8 psi for over 45 minutes. I left the coolant in it but with the cap off. I got the carb off gonna blow it out at work tomorrow. Is a leak in the coolant system gonna make my motor hard to jet & ping. Not sure if the coolant can get in motor except thru head but it test ok on the cylinder test though. The only other thing I question is my pipe to silencer rubber is loose and spewing oil out. I have a billet flange from BDT with all them oring on it last summer I hi-temp siliconed it it really didn't appear to leak but just a little but the silicone was completely gone in there.Trouble jetting 1/8-1/2 throttle pining and wont run smooth at any position. Cuts out like the spark is turned off. It will rev up past fine. This is the first Ive had time to work on it. bdt set up a dome for 50-50 vp110-91 octane. I never had this much trouble last year running straight 91. They shop that sold me fuel said VP has 3 110 octane fuels. Lowest is VP110 then VP blue which is identical to C-12 except its not oxygenated blue in color and is a budget minded fuel missing certian dies that are needed to pass some motorsports rules. He said the VP blue is new this year. Mabey I should try straight race fuel.

rsss396 · « **Reply #1 on:** July 23, 2013, 11:10:59 PM »

I like the idea of trying the straight race fuel for one trip and see how it goes first

JasonB · « **Reply #2 on:** July 24, 2013, 06:19:35 PM »

i may have missed it, but what else have you looked at for this issue? I cant recall for sure, but you do need to seal the pipe. is there spooge on the front of your motor coming from the pipe at the manifold-pipe connection? if so, pull it apart and clean it REALLY GOOD, then rough up the inside of the pipe and the outside of the flange and put black RTV on it and let it cure for 24 hours. after that it should be sealed, if its not sealed and you are getting oil/gas crap on the front of your motor than its not only leaking but also sucking air in leaning the motor out. just a thought. How is your jetting? How do your plugs look?

pantera1975 · « **Reply #3 on:** July 24, 2013, 07:02:37 PM »

Plug is real rich black in color and the jetting is a CEL 2nd clip from the highest setting or 1 notch richer than the center and a 192 main, 55 slow jet