Cosworth TJ V10 Piston

[Maritimer]

24? That's fully double of any installation I've actually seen. I'd love to know what that actually looks like.

Take your 6 original jets and put four outlet nozzles on each of them, boom

[saviour stivala]

24? That's fully double of any installation I've actually seen. I'd love to know what that actually looks like.

Take your 6 original jets and put four outlet nozzles on each of them, boom

Spot-on. “Honda V8 Development of piston oil cooling jets”;- In the initial stages 4 and 6 hole were used in the oil jets. The flow rate injected was higher than 10-l/min. as development proceeded the oil flow rate was steadily increased by means of increasing the diameter of the jets holes from 2mm, but with the use of MMC pistons this modification was not needed. When MMC pistons were banned and returning to the 2000 aluminum pistons crack were getting into a big problem with the increased engine speeds. Increasing the volume of oil flow through the jets simply increased friction. An interim measure was retarding the ignition by 6.5 degrees which resulted in a decreased output. What was needed was an even spread of cooling oil over a wide area which was achieved by the 6 hole per jet per piston being increased to 12 holes and finally to 24 holes.

[e36jon]

[hardingfv32]

What are the words inlet and exhaust describing in the upper part of the illustration?

Brian

[e36jon]

They are referring to the inlet valve side of the piston and the exhaust valve side of the piston.

And a belated 'sorry' for the semi-hijack of a truly excellent thread.

Jon

[saviour stivala]

They are referring to the inlet valve side of the piston and the exhaust valve side of the piston.

And a belated 'sorry' for the semi-hijack of a truly excellent thread.

Jon

'Semi-hijack???' Solid and official technical information is always welcome. just one point if you don't mind. you omitted mentioning that that those piston/oil cooling jets illustrations pertains to Honda F1 V8 engine.

[voice_of_reason]

Interesting post.

[ACRO]

maybe i missed it in the thread , but what is the bore of the tj piston ?

best regards

[voice_of_reason]

maybe i missed it in the thread , but what is the bore of the tj piston ?

best regards

Early specs of the engine had 95mm bore.
Some later specs were built with 96mm bore bottom ends.

[ACRO]

thanks much for the info ! do you have the bore of the cosworth cr3 v10 ( ck family ) ?

[saviour stivala]

thanks much for the info ! do you have the bore of the cosworth cr3 v10 ( ck family ) ?

Cosworth CR-3 (external designation) CK family (internal designation) = CK 2001 used by Jaguar R2.
Cosworth CR-3 (external designation) CK family (internal designation) = CK 2002 used by Jaguar R3. "from Canada CR-4 (external designation) LK 2002 family (internal designation).
Cosworth 2005 TJ005 (external designation) TJ 2005 (internal designation) used by Red Bull RB1, this was series 10 engine, had a 95mm bore and a stroke of 42mm.