It will get to 330..

All numbers at the crank

Torque is, 267 lb/ft 3950 rpm and 272 lb/ft @4425 rpm and 270 lb/ft @4100 rpm and 267 lb/ft @5325 rpm, Thats 5lb/ft of variation in TQ over 1325 rpm

Also, 221 lb/ft @2100 rpm



More to come

Ian

Still have sets avail.
Who wants to make some power

You got pistons for the 2.0S 1969? And 3.4

The 2.0 no
But we have sets for the 3.4 avail

78.5-80 lb-ft torque per liter is pretty solid!

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I'm doing some planning around rebuilding my 2.7, would these new pistons be a good idea?

Is there any value in using this design for a turbo engine build?
My 3.0sc engine is to be rebuilt using 964 crank and rods, and aiming for around 8.5;1....

Not sure if James can have a set custom made with correct pin heights etc?

Mike , this piston is designed to take advantage of the scavenge effect of valve overlap.
Hence the trough cut in the center of the piston.
With a turbo the best bet is the soft dome and sometimes a hollow in the center.
Forced induction makes up for the scavenge effect.

For all other NA 911 engines this piston is very effective .

Just my thoughts

Not currently making new sets. We have to move the current stock of 3.2-3.4 stuff on the shelf.

Moved a few sets more dyno numbers soon from pelican members?

Back up top

Another set shipped waiting for a few dyno results

Monthly humpback up top

I've been wanting to try these but until someone actually posts their results from using them, I'll sit on the fence.
Surely someone must be running an engine with these by now? Or is the "absence of feedback", the feedback in itself?

no offence intended to the seller.

Mike, I am sitting on my 74.4 stroke 98mm set waiting for a build where the client wants to turn a 3.2 into a 3.4. We have been doing smaller and largerdisplacement and watercooled mostly lately. But I am looking forward to buiilding a motor with them.

Cheers

8 sets left in stock

What size pistons are in stock?

Hello guys,

I just wanted to share a dyno chart of a motor that Will Pyle assembled for one of our customers last year, numbers are to the wheels.

It is a 3.4 liter 3.2 with KR75 cams, Apgar pistons, SSI and Dansk muffler, twin plug ECU controlled, PMO throttle bodies. I supplied the Maxxecu engine management system and install support to Will and calibrated it on my dyno. I found the pistons to make for a very efficient combustion chamber requiring less ignition timing to reach MBT.

Two thumbs up from me.

http://forums.pelicanparts.com/uploa...1761061693.jpg

What full-throttle, full-advance timing did you find for max torque?

Pete,

Benefits of full ignition control is to pinpoint the best timing for the full RPM range. That number is dynamic and unique to the fuel choice, ignition control vs actual spark event when ignition control latency isn't calibrated, RPM, and the engine package as a whole. The peak timing number is in the mid 20's in this case.

Michael

Mike, thank you for your reply.

I know that the timing is dynamic and depends on multiple factors, but I was looking for a comparison of the timing at a defined condition to compare to the timing typical of a conventional twin plug piston and chamber at the same condition. If your engine is in the mid-20’s with the Apgar piston, then that puts it in the range of the timing of the twin-plug ignition with a conventional twin-plug piston dome. Is that about right? Or does it require several degrees less advance?

Maybe I am not asking the question in the best way, but I am looking for some method of comparison, without having the same engine, but with conventional twin plug pistons, to run on the dyno for a direct comparison. I think that comparing timing is the next best method.

Pete,

When the hardware allows I do individual cylinder trims as needed so that is why I was ambiguous and mentioned that its dynamic, both this motor I posted about and the comparison motor were timed this way. Also I consider the tune information proprietary to the paying customer.

To give some numeric info though, it has a mean delta of 3-4 degrees less than a full dome piston in a pretty aggressive build on the same regional E10 pump gas.

Mile, thanks. That is what I was looking for.