Piston conversion 2,4 t-K???
10-06-2015, 11:57 AM
#1
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Piston conversion 2,4 t-K???
Hello,
My question to you guys , I have a 2,4 T-k jetronic engine but unable to locate original pistons for it.
Is it possible to use normal pistons from a carb engine and if I do so will the engine still function propperly in combination with the original Bosch K-jetronic system?
Or did somebody already tryed this conversion?
Thanks
My question to you guys , I have a 2,4 T-k jetronic engine but unable to locate original pistons for it.
Is it possible to use normal pistons from a carb engine and if I do so will the engine still function propperly in combination with the original Bosch K-jetronic system?
Or did somebody already tryed this conversion?
Thanks
10-06-2015, 12:18 PM
#2
Rennlist Member
Sure, you can go any number of directions. What's wrong with the current pistons (and likely the cylinders)? Ring land wear? Ovalness in the cylinders? Talk to one of the engine builder experts.
Are you going to continue to use the original CIS? Easy enough to go 2.7L, with the appropriate longevity upgrades, to make the car something more than a 6 cylinder 912.
Are you going to continue to use the original CIS? Easy enough to go 2.7L, with the appropriate longevity upgrades, to make the car something more than a 6 cylinder 912.
10-06-2015, 12:24 PM
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The engine locked up and a few valves got in contact with the pistons and would like to keep rebuid this engine as It is matching to The car.
Sure, you can go any number of directions. What's wrong with the current pistons (and likely the cylinders)? Ring land wear? Ovalness in the cylinders? Talk to one of the engine builder experts.
Are you going to continue to use the original CIS? Easy enough to go 2.7L, with the appropriate longevity upgrades, to make the car something more than a 6 cylinder 912.
Are you going to continue to use the original CIS? Easy enough to go 2.7L, with the appropriate longevity upgrades, to make the car something more than a 6 cylinder 912.
10-06-2015, 01:43 PM
#4
RL Technical Advisor
Hi,
One can still buy the special 84mm K-Jetronic P & C's for those engines through Porsche. While not inexpensive, these are the correct and recommended pistons for K-Jet engines.
For about the same money, you can also get the 90mm 911S P & C's, however the case must be machined to use those.
One can still buy the special 84mm K-Jetronic P & C's for those engines through Porsche. While not inexpensive, these are the correct and recommended pistons for K-Jet engines.
For about the same money, you can also get the 90mm 911S P & C's, however the case must be machined to use those.
10-06-2015, 03:04 PM
#5
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Ok I didn't know this.
I'll check them out.
I know that the case needs to be machined for the 90 mm pistons, but what about the injection system then? Recalibration or Just run It like that?
Thank You for Your reply.
I'll check them out.
I know that the case needs to be machined for the 90 mm pistons, but what about the injection system then? Recalibration or Just run It like that?
Thank You for Your reply.
10-06-2015, 03:35 PM
#6
RL Technical Advisor
The CIS needs to be tweaked to deliver additional fuel if you decide on the 90mm ones.
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10-07-2015, 02:13 PM
#8
RL Technical Advisor
Contact me directly for price quotes.
10-08-2015, 01:26 PM
#9
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Steve,
Sorry for my ignorance but what are squish bands?
I sent you a PM.
Sorry for my ignorance but what are squish bands?
I sent you a PM.
10-08-2015, 02:49 PM
#10
RL Technical Advisor
In this illustration, the bands are narrow due to the 85mm bore size; 90mm pistons require slightly wider ones to prevent piston-to-head contact and help prevent detonation.
10-09-2015, 02:51 PM
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Ok thanks for your reply.
Squish bands are the narrow area between the combustion chamber and the head gasket sealing surface.
In this illustration, the bands are narrow due to the 85mm bore size; 90mm pistons require slightly wider ones to prevent piston-to-head contact and help prevent detonation.
In this illustration, the bands are narrow due to the 85mm bore size; 90mm pistons require slightly wider ones to prevent piston-to-head contact and help prevent detonation.