Rapid Robert
Well-Known Member
what would get me in the ballpark & how should I go about optimizing each one. It has a racing cam, not sure of the specs. thank you for your time. RR
360 2bbl circle track engine, what initial/total
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Is it stock compression and are you required to buy the track race fuel?
Rapid Robert
Well-Known Member
9-1 and can use pump premium or "race gas" not sure what type they are talking about.
If Sea Level I would run 35 to 36 total Advance.
Rapid Robert
Well-Known Member
we're 1200 feet above sea level
Rapid Robert
Well-Known Member
I will see what initial it wants to idle then adjust the curve to get 35 total. thanks John. My first Mopar in 1975 was a 68 440 GTX convertible, 4 speed 4:10 or 4:11 dana! I wish I'd a kept it!
For a Circle Track car I would try to get advance in pretty
quickly. what Distributor are you using?
quickly. what Distributor are you using?
Rapid Robert
Well-Known Member
it is an OE one. I do have the FBO round plate to limit advance/a pertronix HEI race module/not sure on the coil
I would remove the heavier spring and bend the tang on
the lighter one until it barely clears the case. This is a rough and dirty
budget curve!
the lighter one until it barely clears the case. This is a rough and dirty
budget curve!
Rapid Robert
Well-Known Member
the car is not up & running yet. I will note the RPM drop. John should I do this in addition to the FBO advance limiting plate. EDIT the plate has slots for 10-12-14-15-18 crank degrees of advance
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TT5.9mag
Two atmospheres are better than one
Copy that. As a starting point, I’d set it up to be 20-22 initial and 34-35 all in. And I’d probably aim for a medium rate curve. Not too fast, not too slow. Then depending on the rpm drop in the corners, tailor the curve to where the car comes out of the corner best.
Yep, Back in the 70's when I ran a Claimer the RPM never dropped much less 2800/3000
in the corners. Maybe someone who has run them less that 50 years ago may have a
better answer on that question.
Most cars will run in a 2,200 or less rpm range at full throttle depending on track and track conditions etc. Not counting restarts. In his class IMCA hobby stock with the open motor option he needs to be spinning it at the 7000 rpm limit. So he should be in the 4,800 to 7,000 rpm range.
Rapid Robert
Well-Known Member
good comprehensive info & very much appreciated. RR
What piston and cylinder head do you have? Old open chamber LA will probably have a different requirement than a closed Magnum style head. Did a stock stroke 360 for a USRA stock car a few years ago. Different animal than yours, yes. 10.5 with 318B EQ heads. Dyno tested, the sweet spot was 30 degrees all in by about 2300. Went up and down with timing, 30 was always the number.
Rapid Robert
Well-Known Member
flat top pistons & EQ magnum heads. I will go conservative on the timing
TT5.9mag
Two atmospheres are better than one
That’s a narrow window for sure.
These two bits of info make me think locking the timing at 30 sending it is the easy button here.
On the dyno, we had gone as much as 35 with no detonation. Just lost power.
Agree. However on the track when acceleration the RPMs quickly we
have performed better with the 35. Perhaps it is more tolerant of more
timing than at a steady state?
My .02 = For Free!
Your MPG may Vary.
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