924Board.org

[safe]

Turbo head, custom JE pistons to get 10:1 compression, at least, ITB with EFI.
A good start. Stock rods are ok but heavy, should be ok with a little higher revs.

Mixing of the shelf parts from other engines on a budget requires that you really know what you are doing. If you need to modify parts and cant do it your self it quickly adds $$$.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, under EFI and turbo conversion

[Juho]

there must be a car with right bore and compression height, but its hard to find specs of oem pistons

[Fasteddie313]

924 bottom end is super strong, might need to refresh the head gasket, but it should be able to take a lot of nitrous..

Maybe like a 50 shot on a wot switch and another 50 on a button.. wet..
Whatever your trans can handle..

Way quicker, easier, and cheaper..

That’s probably what I’d do with an NA..
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80 Turbo - Slightly Modified

[Juho]

engine is in parts atm, maybe il just throw rods and cheap forged pistons and make some boost. Going na doesent seem worth it for me atm

[safe]

Cheep forged pistons would still be custom JEs... I dont think you will get away with less than the 8-900~ish euros for that.

The 924 pistons have an unusual high compression height.

If there was a good option for cheep pistons you would find it on this forum.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, under EFI and turbo conversion

[Juho]

been thinking of vw flat tops but if they are forged is little questionable

[safe]

[Juho]

what about grinding crank to use different rods?

like this http://www.924board.org/viewtopic.php?t=36293&postdays=0&postorder=asc&start=0

[Juho]

finding the rods used in this setup wasnt hard but the pistons are hard to find, not sure if they are off the shelf anymore


found even better rods with less to grind away from crank but idk about offset grinding the crank

[safe]

Like I said, if you are going to use parts not made for the 924 you need to know what you are doing. If you cant figure it out for yourself, its not for you.

Grinding the crank and rehardening it, I think you are not in a cost effective mode anymore. Grinding the crank would only be something I consider for stroking the engine (offset grind).
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, under EFI and turbo conversion

[Juho]

I know how the offsetgrinding works, but machine shops here wouldnt probaly do it, and the money spent on crank work could be put on custom pistons.

[Juho]

Found pistons off the shelf that would give high compression with the 931 head but the pin size is different, could they be machined to fit with 924 rods?