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Bench Data

General engine tech -- Drag Racing to Circle Track

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SpeierRacingHeads
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Re: Bench Data

Post by SpeierRacingHeads » Sat Oct 05, 2019 11:28 am

Head I'm using.

40 top 45 set with a 2.08/1.600 8mm LS valve

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Re: Bench Data

Post by cv67 » Mon Oct 07, 2019 12:08 pm

Nice work
What do you recommend for someone looking to install guides to use 8mm valves?
They would be Dart knockoffs

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Re: Bench Data

Post by SpeierRacingHeads » Thu Oct 10, 2019 7:24 pm

cv67 wrote:
Mon Oct 07, 2019 12:08 pm
Nice work
What do you recommend for someone looking to install guides to use 8mm valves?
They would be Dart knockoffs
All I use is the RAPID liners and tooling.

But you can buy new guides as cheap.
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Re: Bench Data

Post by SpeierRacingHeads » Sat Oct 12, 2019 10:32 am

All in all done with manifold. 6% loss to the front two. 2-4% all the rest.

Engine going together this weekend.

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Re: Bench Data

Post by SpeierRacingHeads » Mon Oct 14, 2019 4:36 pm

Got the crank, rods, pistons install over the weekend. Scat LW crank and rods. Mahle 1-1-2mm pistons. Bob weight came in at 1660g.

4.165 x 3.48

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Re: Bench Data

Post by SpeierRacingHeads » Thu Oct 17, 2019 5:22 pm

OLD SKOOL tell death.

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Re: Bench Data

Post by GARY C » Thu Oct 17, 2019 5:57 pm

Looks good!
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Re: Bench Data

Post by SpeierRacingHeads » Fri Oct 18, 2019 5:21 pm

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Re: Bench Data

Post by tt 383 » Fri Oct 18, 2019 5:56 pm

SpeierRacingHeads wrote:
Sat Oct 12, 2019 10:32 am
All in all done with manifold. 6% loss to the front two. 2-4% all the rest.

Engine going together this weekend.

Image

Image
Chad thanks for the pics, always interesting to see someones work. Wondering why those intake elbows are always straight and not belled somewhat just above the plenum, maybe shaped somewhat like a blowthru bonnet for a carb? I know some elbows for those forward facing throttle bodies have a divider top help even out front/back flow. Any insights if you have tested any of that? How close have you gotten the front and back with a converted carb intake elbow combination?

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Re: Bench Data

Post by SpeierRacingHeads » Fri Oct 18, 2019 6:01 pm

tt 383 wrote:
Fri Oct 18, 2019 5:56 pm
SpeierRacingHeads wrote:
Sat Oct 12, 2019 10:32 am
All in all done with manifold. 6% loss to the front two. 2-4% all the rest.

Engine going together this weekend.

Image

Image
Chad thanks for the pics, always interesting to see someones work. Wondering why those intake elbows are always straight and not belled somewhat just above the plenum, maybe shaped somewhat like a blowthru bonnet for a carb? I know some elbows for those forward facing throttle bodies have a divider top help even out front/back flow. Any insights if you have tested any of that? How close have you gotten the front and back with a converted carb intake elbow combination?
Because it needs to fit under the hood. I tested everything on this. The front two runners have a 5.8% loss, the rest 4%. Within less than 1% of the carburetor and spacer.

Something else of interest. Have a couple of Super Stock customers that run the Edelbrock elbow and a 58mm and they want me to do this type for them.
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Re: Bench Data

Post by tt 383 » Fri Oct 18, 2019 6:56 pm

SpeierRacingHeads wrote:
Fri Oct 18, 2019 6:01 pm
tt 383 wrote:
Fri Oct 18, 2019 5:56 pm
SpeierRacingHeads wrote:
Sat Oct 12, 2019 10:32 am
All in all done with manifold. 6% loss to the front two. 2-4% all the rest.

Engine going together this weekend.

Image

Image
Chad thanks for the pics, always interesting to see someones work. Wondering why those intake elbows are always straight and not belled somewhat just above the plenum, maybe shaped somewhat like a blowthru bonnet for a carb? I know some elbows for those forward facing throttle bodies have a divider top help even out front/back flow. Any insights if you have tested any of that? How close have you gotten the front and back with a converted carb intake elbow combination?
Because it needs to fit under the hood. I tested everything on this. The front two runners have a 5.8% loss, the rest 4%. Within less than 1% of the carburetor and spacer.

Something else of interest. Have a couple of Super Stock customers that run the Edelbrock elbow and a 58mm and they want me to do this type for them.
Ahh ok, so not much difference from a carb. I figured there was a space constraint as low as it is. Thanks for the explanation and insight to limitations you were working with.

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Re: Bench Data

Post by cv67 » Fri Oct 18, 2019 7:10 pm

nice work as usual....what kind of improvements did you see going from 2.02 to 2.08 intake on those?
Are those the cnc heads you do or the epoxied ones

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Re: Bench Data

Post by SpeierRacingHeads » Fri Oct 18, 2019 8:10 pm

cv67 wrote:
Fri Oct 18, 2019 7:10 pm
nice work as usual....what kind of improvements did you see going from 2.02 to 2.08 intake on those?
Are those the cnc heads you do or the epoxied ones
This head is my 205cc CNC head with the big bore. Also have it in a small bore version.
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Re: Bench Data

Post by 289nate » Tue Oct 22, 2019 12:19 pm

Are you afraid those shorty headers are going to hurt the power numbers?

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Re: Bench Data

Post by SpeierRacingHeads » Tue Oct 22, 2019 1:30 pm

289nate wrote:
Tue Oct 22, 2019 12:19 pm
Are you afraid those shorty headers are going to hurt the power numbers?
probably, but long headers and dual exhaust is a PIA in a 3rd gen unless you like it hanging down 3".
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