I need the numbers for leaking down a barrel valve on a Bird Catcher Tunnel Ram setup

I need the numbers for leaking down a barrel valve on a Bird Catcher with a Block Style Barrel Valve at idle

It is on a 500 inch Chevy #32 port nozzles and on a Edelbrok tunnel ram.

Thanks
Bob

 

Hi, I'm don't wont to high jack your thread sorry, but as far as egt temps go I'm guessing that it would be the same even on a smaller engine say a 355? What about a blown engine.?
I was once told to ignore your egt as its not a good reflection of air fuel ratio, as too much fuel and timing to low may push up your egt as the fuel is burning in the pipes. I also guess camshaft will have some effect? Sorry for so many questons, I just have a lot to learn. Thanks

 

Mike C. No blower on the OPs engine.

Dave Koehler
http://www.koehlerinjection.com

 

Hijack thread
Mike Cantor,
Mike did you forget about me?
poppets.

 

82%?

Mike, I use a duel gauge snap-on cylinder leak down gauge. I thought it was around 28% at .005 blade clearance, and around 95% at full throttle. "500 CID BBC and no blower
on Alcy"

Am I reading it wrong?

Thanks
Bob

 

For that size engine with an 80a-1 pump start at .006 on the BFs and 36% on the BV.
It will start and run.
Then adjust to suit.
When done leak it again to find out where you wound up.
That is your baseline for that engine.

Dave Koehler
http://www.koehlerinjection.com

 

Bob, I think you are confusing the second gauge reading for leak into the motor when that's actually leak back to the tank. If second gauge reads 25% then that's 75% leak to the motor and 25% leak back to the tank. Most people mean leak to the motor. Best way to remind yourself is see what the second gauge does when you open the throttle...it goes to 0, meaning 100% to the motor 0% back to the tank relatively speaking cause we know there's a return % going through the main jet, however your returns should be blocked off. Hope this helps...

Josh

 

You know I was wrong on my previous post. I wondered about your snap on deal and looked it up. Sure enough snap on has their second gauge read backwards so you don't have to do the math to figure %. If you are at "25" on the second gauge on your snap on setup then that is in fact 25% leak TO the motor. That's really lean at idle. On a blower deal we are usually 75%ish leak to the motor. Normal leak testers will be set at say 100 psi on left gauge and right will say 25. That would mean 75% leak to motor. Clear as mud?

 

Leak down

% of leak has no bearing on lean or rich when comparing others setups. It's just a reference point. Once established it can be used to say lean or rich on your combo. 25% leak at 100 psi of fuel pressure is way more than 25% leak at 10 psi of fuel pressure. Like every is saying get it running right and then leak it for reference.