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Bench Data

General engine tech -- Drag Racing to Circle Track

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MadBill
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Re: Bench Data

Post by MadBill » Mon Sep 16, 2019 9:39 pm

Be interesting to test-glue in a turning vane down the centerline. In the stock elbows of a 1988 Firebird system I tested, they added ~ 4% each.
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Re: Bench Data

Post by Outlaw383 » Mon Sep 16, 2019 10:32 pm

Chad you stated those were too fast, what fps would you prefer to see in that area of the floor on a head that size ?

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Re: Bench Data

Post by SpeierRacingHeads » Tue Sep 17, 2019 11:37 am

Outlaw383 wrote:
Mon Sep 16, 2019 10:32 pm
Chad you stated those were too fast, what fps would you prefer to see in that area of the floor on a head that size ?
Not sure I care as long as it's the same across and the SSR can handle it with shape or volume.
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Re: Bench Data

Post by SpeierRacingHeads » Thu Oct 03, 2019 12:08 pm

Started bench work. Baseline.

Flow test with just head
Middle with elbow/TB
Bottom with Carb

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Re: Bench Data

Post by Carnut1 » Thu Oct 03, 2019 4:56 pm

If anyone can get that air to bend around it would be Chad. I like the plenum mods.
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Re: Bench Data

Post by MadBill » Thu Oct 03, 2019 5:16 pm

OK, I spent way too much time trying to figure out in the last pic how what looked like chunks of foam rubber stuffed in the runners was really some sophisticated epoxy fill job. It finally clicked that it was foam, plugging the runners that were not being flowed. #-o :oops:
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Re: Bench Data

Post by FC-Pilot » Thu Oct 03, 2019 5:32 pm

MadBill wrote:
Thu Oct 03, 2019 5:16 pm
OK, I spent way too much time trying to figure out in the last pic how what looked like chunks of foam rubber stuffed in the runners was really some sophisticated epoxy fill job. It finally clicked that it was foam, plugging the runners that were not being flowed. #-o :oops:
On my Ipad I thought he filled the floor of all but one runner. It was a good thing I did not mention anything until I saw it on a full size computer screen. Yep, just foam. LOL

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Re: Bench Data

Post by GARY C » Thu Oct 03, 2019 6:23 pm

FC-Pilot wrote:
Thu Oct 03, 2019 5:32 pm
MadBill wrote:
Thu Oct 03, 2019 5:16 pm
OK, I spent way too much time trying to figure out in the last pic how what looked like chunks of foam rubber stuffed in the runners was really some sophisticated epoxy fill job. It finally clicked that it was foam, plugging the runners that were not being flowed. #-o :oops:
On my Ipad I thought he filled the floor of all but one runner. It was a good thing I did not mention anything until I saw it on a full size computer screen. Yep, just foam. LOL

Paul
I am not going to admit I thought the epoxy thing also.
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Re: Bench Data

Post by SpeierRacingHeads » Thu Oct 03, 2019 9:09 pm

Foam out of Ferrea boxes! :)

Simple and easy.
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Re: Bench Data

Post by SpeierRacingHeads » Fri Oct 04, 2019 12:37 pm

I think it's golden. 6% loss to the front runner through the elbow/TB.

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Re: Bench Data

Post by Carnut1 » Fri Oct 04, 2019 2:22 pm

I think that is excellent that you only lost 6% on the front. I am interested in the difference flow wise from front to back on the manifold. Thanks, Charlie
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Re: Bench Data

Post by Elroy » Fri Oct 04, 2019 2:49 pm

Good flow// Excuse me if this has already been said////what made you decide to change to a different head casting?////Was the first set coming up short of flow goals?

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Re: Bench Data

Post by SpeierRacingHeads » Fri Oct 04, 2019 3:00 pm

Elroy wrote:
Fri Oct 04, 2019 2:49 pm
Good flow// Excuse me if this has already been said////what made you decide to change to a different head casting?////Was the first set coming up short of flow goals?
No, I just wanted to use my CNC 205cc head.

Basically I built a 13-1 (4.165x3.48) drag engine (VP113) with the same heads and a 260/268 w/.680 lift and I want to see what this does (same bore/stroke) on the same dyno with 11-1 (91 octane) and a 231/236 w/.580 lift.

Just trying to learn something!
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Re: Bench Data

Post by Elroy » Fri Oct 04, 2019 3:13 pm

OK good go then.////////should have more than enough flow for the goal//should be easy to get there.

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Re: Bench Data

Post by SpeierRacingHeads » Fri Oct 04, 2019 3:20 pm

Elroy wrote:
Fri Oct 04, 2019 3:13 pm
OK good go then.////////should have more than enough flow for the goal//should be easy to get there.
I agree. I put LS 8mm valves in these heads and using a small dual roller spring.

I will need to dyno with a carb, which just saves the injector harness grief.

I will chassis dyno it, so I will have all the data I need.. I hope.
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