Thread: Tunnel ram set up

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Originally Posted by green34ford

That was a nice ride , thanks for taking the time to do that. you sure do have it set up dead on it sounded perfect no hesitation at all. I ran a across a dual quad set up on craigslist with carbs for a good price now I need to get my but in gear.
Congratulations on the nice ride and I like the truck in the background also in post #4

Thanks!! A couple of things(mistakes) I learned when tuning the carbs is to get the primary circuit correct first(jets),I made the mistake of increasing the squirters to get rid of the low end bog(was up to a #37)but when at highway speed it was way to lean(the squirter helps with the transfer from idle circuit to primary circuit)I am down to a # 28 squirter now). Jets-4 jets from summit cost $14+ and holley suggest to jump 2 sizes at a time(that could be alot of jets if you don,t have access to jets)local drag racer gave me his drill set #1-50,told me to drill the jets a thousand,s at a time till I got where I need to be(holley does not recommend drilling jets) You can always buy the correct jets after you dial it in. Hope that makes any sense.A vacumn gauge is a must(lets you know while you are driving when your power valve is opening)You do not want it to be opening while at highway speeds(power valve is to help make the transfer from primary circuit to secondary circuit) spring in vac diaphragm. Pete

Originally Posted by prpmmp

Thanks!! A couple of things(mistakes) I learned when tuning the carbs is to get the primary circuit correct first(jets),I made the mistake of increasing the squirters to get rid of the low end bog(was up to a #37)but when at highway speed it was way to lean(the squirter helps with the transfer from idle circuit to primary circuit)I am down to a # 28 squirter now). Jets-4 jets from summit cost $14+ and holley suggest to jump 2 sizes at a time(that could be alot of jets if you don,t have access to jets)local drag racer gave me his drill set #1-50,told me to drill the jets a thousand,s at a time till I got where I need to be(holley does not recommend drilling jets) You can always buy the correct jets after you dial it in. Hope that makes any sense.A vacumn gauge is a must(lets you know while you are driving when your power valve is opening)You do not want it to be opening while at highway speeds(power valve is to help make the transfer from primary circuit to secondary circuit) spring in vac diaphragm. Pete

Thanks for posting the details, Pete. Makes perfect sense, and drilling out the jets (using a hand pin vise, I assume) seems like the only way to go unless one had access to a full range of "loaner" jets to play with. The vacuum gauge comment is a very good tip for the power valve, too. I like the clarification that the power valve is like the "squirters", but for the primary/secondary transition. Great video, too.

I found Holley carbs not overly difficult to tune. You simply have to learn how each part functions in the scheme of things and make adjustments accordingly. Now, with the advent of O2 sensors and gauges, tuning has become more precise.

Originally Posted by rspears

Thanks for posting the details, Pete. Makes perfect sense, and drilling out the jets (using a hand pin vise, I assume) seems like the only way to go unless one had access to a full range of "loaner" jets to play with. The vacuum gauge comment is a very good tip for the power valve, too. I like the clarification that the power valve is like the "squirters", but for the primary/secondary transition. Great video, too.

Hey Roger!! Yes drilling using a hand pin vise-they are very small bits-would break easily. I use my 18 volt dewalt to hold the bit then turn the jet around the bit a thousandth at a time(takes a while to do 4 but its free) I was lucky to find 2 mechanics and drag racers who love carbs and explained them to me,told me the steps and it worked out,I hope I explained it well enough so a hobbyist like myself can tune a carb. Thanks Pete