2332 cc Raptor venturi jetting suggestions

[neil68]

I have some dynojet time scheduled in a few days.

2332 cc, Italian IDA's (3rd hole), Raptor 44 mm vents, MS230 heads 48 X 37.5 valves, 10:1 CR, 94 CLC octane (98 RON), Raptor cam 274 degrees @1.27 mm/10.8 mm lift, 1.4 rockers, etc.  Given the limited time to make changes on the dyno, I'm wondering what some of you have ended up using with the Raptor venturies in your IDA's?

I'm starting with F2 tubes (as JPM recommends in their instructions) and have a few sets of main & airs in the 170-220 range, and can enlarge some of them on the spot with the jet reaming kit, if needed.

Thanks.

[Phil West]

Hi Neil,

I did some racing/tuning at bug jam on Friday and ended up with 180 main 210 air on the f2, my motor is similar to yours.  Hope that helps!

Phil

[neil68]

Thanks, that is similar to my jetting last year with 42 mm Weber venturies.

Now that I have 44 mm Raptor vents, I've tried 180-185 for both main & air jets, as per the baseline instructions that came in the kit. I was able to run slightly faster ET and top speed.

Using 34 degrees advance, but will test with 30, 32, etc.

 

[Phil West]

Thanks, that is similar to my jetting last year with 42 mm Weber venturies.

Now that I have 44 mm Raptor vents, I've tried 180-185 for both main & air jets, as per the baseline instructions that came in the kit. I was able to run slightly faster ET and top speed.

Using 34 degrees advance, but will test with 30, 32, etc.

 

I have 2332, 1.4s, 44mm JPM vents (in 51.5s) 32 advance, FK87 550 thou lift 109 RON 12:1 46/37.5 valves and started with the JPM baseline 180/180.  In my case I found it wanted more air and went quicker at 180/210  11.51@115.  Was still a bit rich but was a very hot day.  Will be interesting to see what results you get on the dyno.  Best of luck!

Phil

[neil68]

We ended up with the best test using F2, 185 main, 210 air and 33 degrees advance. This produced 204.21 WHP and 175.45 lb-ft torque.

I might increase the CR a bit next...I can go to 11:1 by swapping head gaskets.

[spanners]

As a slight aside, i think you guys can run nearer stoic than i can, I run 45 Dells on my 2.5 Wasser boxer circuit car at 10.5 cr, 185m x 210 air on 40 chokes, @34 deg adv, on paper it would seem very fat, but plug chops after a race tell me not to go any leaner! More a straw colour than a cup of cocoa...

[Phil West]

We ended up with the best test using F2, 185 main, 210 air and 33 degrees advance. This produced 204.21 WHP and 175.45 lb-ft torque.

I might increase the CR a bit next...I can go to 11:1 by swapping head gaskets.

Interesting, that jetting is in the same ballpark as mine.  What RPMs were your peak HP and peak torque. Cheers

[neil68]

Peak HP at 6,600 rpm, and fairly flat 6,000-7,200.

Peak torque at 5,800 rpm, and fairly flat 4,500-7,500.

7,500 rev limit pill.