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Dyno result for the risky business Porsche

General engine tech -- Drag Racing to Circle Track

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ptuomov
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Re: Dyno result for the risky business Porsche

Post by ptuomov »

englertracing wrote: Sun Apr 19, 2020 11:28 pm
ptuomov wrote: Sun Apr 19, 2020 6:45 pm
englertracing wrote: Sun Apr 19, 2020 6:23 pm Did you guys consider gutting that block for a darton mid type installation?
Give that we want to stay with 100mm bore, sleeves of any kind would be a huge cost and unreliability problem. Can be done in a way that lasts but it’s a huge learning curve for this block and even in the end it’ll be way, way more expensive that Nikasil plating.
Um actually the darton mid design was really a solution to open deck block related issues.
Since we don’t have any of those issues at our cylinder pressure levels, aren’t those sleeves then just an expensive solution to a non-problem, for us? We just need to be able to run modern pistons, everything else works as is.
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Re: Dyno result for the risky business Porsche

Post by englertracing »

Arent you going to keep feeding it more boost
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Re: Dyno result for the risky business Porsche

Post by Bwh998 »

Beautiful engine bay, thanks for the picture.
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Re: Dyno result for the risky business Porsche

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englertracing wrote: Mon Apr 20, 2020 9:50 am Arent you going to keep feeding it more boost
Nope, because the manual transmissions can’t hold it. That’s why we are going with more rpms not more boost.
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Re: Dyno result for the risky business Porsche

Post by ptuomov »

An engine assembly video from a couple weeks ago:

https://youtu.be/6y6grFlNr20

The breakaway torque of the assembled short block ended at 9 lbf-ft.
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Re: Dyno result for the risky business Porsche

Post by ptuomov »

Some assembly photos:
223B30B2-18E9-4179-8990-0FC3EF2E6B2B.jpeg
46EA3BFF-9862-4033-AC5E-D96938A48111.jpeg
A13F94E6-465F-4FD8-A51E-0053A658042E.jpeg
6F8653D9-21FA-4976-8400-BCA7C351C64E.jpeg
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Re: Dyno result for the risky business Porsche

Post by ptuomov »

The long block is in the car:
LongBlock.jpeg
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Re: Dyno result for the risky business Porsche

Post by Fusion Works »

Any idea what this engine weighs?
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Re: Dyno result for the risky business Porsche

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Fusion Works wrote: Sun Jun 28, 2020 9:57 pm Any idea what this engine weighs?
Accessories are very heavy so as always it depends. If you include all the accessories and emissions gear, it must be close to 600 lbs. based on shipping weights? The long block isn't nearly as heavy but I don't have a number for you.
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Re: Dyno result for the risky business Porsche

Post by ptuomov »

Models Dimensions Tolerances book for:
928 81, 82 Models
928 S 80, 81, 82, 83, 84 Models

Engine weight (dry)
Pg. 14 '81-'82 M28.09/10/15/16 245kg
Pg. 17 '80-'83 M28.11/12/19/20 261kg
Pg. 17 '84 M28.21/22/19/20 261kg


Technical Specifications book for:
928 S Models 85, 86
928 S4 Models 87, 88, 89

Engine weight (dry)
Pp. 16 & 17
85/86
928 S
M28.21/22 261kg
M28.43/44 264kg

86-89
928 S M28.45/46 264kg
928 S4 M28.41/42 264kg
928GT M28.47 264kg

264 kg = 582 lbs. These are with all the accessories, which are very heavy.

The engine external dimensions are not too far from BBC, the bore spacing is 122mm. Deck height isn't too long, but then the four-valve heads make it look like a tall deck block from the external dimensions. It's a small miracle that the engine could be designed to be low enough to fit under the 928 hoodline.
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Re: Dyno result for the risky business Porsche

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Delayed video update:

https://youtu.be/HHxZ5yqs1P8
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Re: Dyno result for the risky business Porsche

Post by ptuomov »

Custom cast exhaust manifolds bolted on, ready to have the turbos to be attached.
B209C997-734D-4225-85D7-B1722A7C48CA.jpeg
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Re: Dyno result for the risky business Porsche

Post by dannobee »

Those look pretty low in the chassis. Are you running a scavenge pump on the drains?

As far as the gaskets, most manufacturers have moved away from paper and cork gaskets and use either a variation of silicone and a steel shim, or clean up everything and run no gaskets and just some variation of Three Bond/GM Sealer. As you described in the video, it seals very well and requires a few taps with a rubber mallet to separate the two parts.
Last edited by dannobee on Sun Jul 05, 2020 10:06 am, edited 1 time in total.
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Re: Dyno result for the risky business Porsche

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dannobee wrote: Sun Jul 05, 2020 9:54 am Those look pretty low in the chassis. Are you running a scavenge pump on the drains?
Yes, no other way to fit them.
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Re: Dyno result for the risky business Porsche

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Maybe we’ll fire it up one of these days?
8EA577E8-3E8C-4DD3-811E-139CA121D904.jpeg
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