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1500cc Okrasa
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Vintage oval
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PostPosted: Fri Nov 25, 2011 4:49 pm    Post subject: 1500cc Okrasa Reply with quote

I'm finishing up a 1500cc Okrasa 36hp motor with custom handmade linkage and would like some help jetting the Solex P40-11 carbs. The motor is 74mm x 80mm. Cam is 265 Dur, .322 Lift and the compression Ratio 8.5:1. The ventures are 32mm.

I'm in the Denver area and I'm thinking of using 122.5 mains, 180 air correction, 965 pilot. Has anyone used the P40-11 on Okrasa heads before that might be able to give me some suggestions on the jetting?



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alanhall
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PostPosted: Fri Nov 25, 2011 6:22 pm    Post subject: Reply with quote

Don't have experience with the Okrasa heads, but the jetting you are suggesting is standard for a split shaft 40PII-4 on a late 912 Porsche, 1600cc 9.3:1 CR. Might be a little rich for 1500 cc in Denver, perhaps a 115 or 120 main might work better. Are your carbs solid or split shaft? Engine looks great by the way!!
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Vintage oval
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PostPosted: Fri Nov 25, 2011 7:33 pm    Post subject: Reply with quote

Thanks for the info. The carbs are solid shaft. I have both split and solid shafts but decided to use the solid shaft as they look more period correct for the motor. I was trying to build something that looks it could of been built in the mid to late 50s
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splitpile
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PostPosted: Fri Nov 25, 2011 9:57 pm    Post subject: Re: 1500cc Okrasa Reply with quote

Vintage oval wrote:
I'm finishing up a 1500cc Okrasa 36hp motor with custom handmade linkage and would like some help jetting the Solex P40-11 carbs. The motor is 74mm x 80mm. Cam is 265 Dur, .322 Lift and the compression Ratio 8.5:1. The ventures are 32mm.

I'm in the Denver area and I'm thinking of using 122.5 mains, 180 air correction, 965 pilot. Has anyone used the P40-11 on Okrasa heads before that might be able to give me some suggestions on the jetting?



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Beautiful
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gimmesomeshelter
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PostPosted: Fri Nov 25, 2011 10:22 pm    Post subject: Reply with quote

Hello-

I'm so jealous!

I bought some Zenith carbs recently, but now I'm having second thoughts. Wink

Cheers,

Paul
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grueni
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PostPosted: Fri Nov 25, 2011 10:27 pm    Post subject: Reply with quote

very beautiful. in first thoughts i would say the vents could be too big for this engine in low and mid range.
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Vintage oval
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PostPosted: Fri Nov 25, 2011 10:53 pm    Post subject: Reply with quote

I also have a set of 28mm ventures that I can try out on the carbs if the 32mm take away too much from the low end and mid range.
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Roadcow
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PostPosted: Sat Nov 26, 2011 12:23 am    Post subject: Reply with quote

Talk with Richard Troy, I used his Okrasa 1500cc with those same carbs at Bonneville 2 years ago. Ran 92 mph in my Ghia. Beautiful engine.
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alanhall
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PostPosted: Sat Nov 26, 2011 12:39 am    Post subject: Reply with quote

Just for comparisons the jetting used for solid shaft 40PII-4 on the 356 1600 Super 90 motor was: 115 main, 32 venturies, 57.5 idle, 1.8 idle air, 50 pump, and #25 emmulsion tube. The jetting used for the solid shaft, sand cast 40PII-4 on a 1500GS 4-cam motor was 102.5 main, 30 venturis, 50 idle, 1.5 idle air, 50 pump and #33 emmulsion tube. The sand cast 40PII-4 were similar but a somewhat different design compared to the later die cast 40PII-4 carbs.
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oldbusboy Premium Member
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PostPosted: Sat Nov 26, 2011 2:41 pm    Post subject: Reply with quote

That motor looks awesome!

Sorry, nothing to add to the jetting question, but I'd love to see a video of that running.

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Louis
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PostPosted: Sun Nov 27, 2011 2:08 am    Post subject: Reply with quote

where did you get the manifold?


cheers!
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Vintage oval
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PostPosted: Sun Nov 27, 2011 6:14 am    Post subject: Reply with quote

I got the manifolds from Speedwell USA.
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Jacks
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PostPosted: Sun Nov 27, 2011 11:27 am    Post subject: Re: 1500cc Okrasa Reply with quote

Vintage oval wrote:

I'm in the Denver area and I'm thinking of using 122.5 mains, 180 air correction, 965 pilot.


What is a 965 pilot?
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Louis
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PostPosted: Mon Nov 28, 2011 12:33 pm    Post subject: Reply with quote

any phone number for speedwell?
i emailed him from his website but no answer.

love those manifold... want them!
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Louis
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PostPosted: Mon Nov 28, 2011 12:35 pm    Post subject: Reply with quote

are those carbs too big or they work great for this motor?

anyone want a set of pbic32?

cheers!
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gimmesomeshelter
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PostPosted: Tue Nov 29, 2011 1:53 pm    Post subject: Reply with quote

Hello-

Regarding your choice of ventruis, how do you want your car to drive?

Do you prefer to step on the gas at 2K and have something happen? If so, try the 28mm venturis first. If you prefer to let all the other cars pass you by until you finally reach 4K, then go with the 32mm. Given the modest duration of your cam, I suspect that the 32mm venturis may be a bit of a mismatch. Keep in mind that Pre-A Supers came with 26mm venturis for for normal driving, and used 29mm for racing.

Cheers,

Paul
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rcraigbug
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PostPosted: Tue Nov 29, 2011 5:44 pm    Post subject: Reply with quote

Louis wrote:
any phone number for speedwell?
i emailed him from his website but no answer.

love those manifold... want them!


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gimmesomeshelter
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PostPosted: Mon Jan 23, 2012 10:37 pm    Post subject: Reply with quote

Hello-

Have you made any progress with your carbs?

Cheers,

Paul
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earthquake
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PostPosted: Tue Jan 24, 2012 12:32 am    Post subject: Reply with quote

That motor is beautiful but it should be hung on a nicer stand...
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Vintage oval
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PostPosted: Wed Jan 25, 2012 10:27 pm    Post subject: Venturs Reply with quote

Here is an update on the ventures. I am looking a drivable engine, not a race engine so I am thinking of going with 26mm ventures. These will give me around 4500 rpm limit and will give torque in the lower range which I think will make it more drivable in the city. Anyone have any experience with selecting ventures for a 1500cc engine with two dual carbs?
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