WANTED: forged 11.1:1 pistons!

[Matt Holcomb]

Well, my cylinders are worn -- they're actually ovoid, but they're salvageable. I need a set of forged 11.1:1 pistons (new or used) so I can retain the modified, cast-iron cylinders.

Anyone with any leads? Anyone with any forged 11.1:1 pistons they'd like to sell?

I'm selling my 88.7mm, 10.5:1 (or 10.8:1) forged ARIAS, but I have no idea what they're worth. My highly respected wrench says they're in excellent condition, but, of course, they'll need new rings.


Matt Holcomb
1974 911 Carrera 2.7 Euro-spec
Dedicated Homepage
Engine Rebuild Homepage
Porsche Owners Gallery Profile
Pelican Gallery Profile

[This message has been edited by Matt Holcomb (edited 08-21-2001).]

[CamB]

Matt

Can you please describe what your cast iron cylinders were like, ie what they started life as (from a 'T'??) and what they are like now. I know they came with the car, but do you know how they got there?

I know you mentioned it in a previous post, but I guess I am after more details...

And what does a set of rings for those pistons cost - any idea?

Thanks!

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Cameron Baudinet
1975 911S (in bits)
1969 911T

[This message has been edited by CamB (edited 08-21-2001).]

[Matt Holcomb]

Cam,

My wrench, John Gregory, tells me that these cast-iron cylinders were custom made, and that the fins from the original 2.7 cylinders -- and the fins only -- were fitted to these cylinders.

http://www.holscope.com/74Carrera2.7/rebuild/diary_entry8.html

As for the cost of rings for these ARIAS pistons, I'm not sure. If I end up buying a set of oversize pistons from ARIAS, then the rings will be bundled with them. I have no reason to believe that rings for these pistons would cost any more than rings for a set of JE pistons.

ARIAS have a website.

http://www.ariaspistons.com


Matt Holcomb
1974 911 Carrera 2.7 Euro-spec
Dedicated Homepage
Engine Rebuild Homepage
Porsche Owners Gallery Profile
Pelican Gallery Profile

[Early_S_Man]

Matt,

What kind of gas are you planning on feeding the engine? Even with a dual-plug conversion, that is quite a bit higher compression than 98 or 100 octane puimp gas would ever tolerate these days! The factory never used compression ratios higher than 10.4:1, even with dual plugs, and with 106 octane racing gas!

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

[Matt Holcomb]

Warren,

I'm concerned, too. But my mechanic hasn't mentioned anything about possible octane-compatibility problems or the dual-plug conversion, and all he does is build successful high-CR (MFI) race engines.

He advised me to get prices for oversize pistons with a CR of either 10.5:1 or 11.1:1.

I'll make sure to ask him when next I see him.


Matt Holcomb
1974 911 Carrera 2.7 Euro-spec
Dedicated Homepage
Engine Rebuild Homepage
Porsche Owners Gallery Profile
Pelican Gallery Profile

[Early_S_Man]

Matt,

I'm sure your mechanic knows what he is doing regarding racing engines ... but, racing engines don't have to be worried over about street gas quality!

You are planning on driving your car on the street with this engine, on 'street' gas, right? if so, I think you would be wise to limit your compression to 10.5:1.

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

[Matt Holcomb]

Warren,

Yeah, best to play it safe! If you were in the market for new pistons, who would you call?

[Early_S_Man]

Matt,

I think JE would suit my or your needs just fine.

Have you considered boring out those sleeved cylinders to 92 mm ... to make it a 2.8?
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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

[This message has been edited by Early_S_Man (edited 08-22-2001).]

[Paul W]

Hi Matt

You may have already gone this direction but give Dennis a call at Aporschapart. He has great contacts both locally and O/S for all this sort of stuff. Second bet would be The 911 Factory, who always has all sorts of stuff around – if not a stocked item they might be able to point you in the right direction. May also be worth posting a request on the NSW Porsche Car Club Site, which is frequented by many racers.

Good luck




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Paul
Modified 1969 911T 2.4
1999 Audi A4 V6

[Matt Holcomb]

Originally posted by Early_S_Man:
Matt,

I think JE would suit my or your needs just fine.

Have you considered boring out those sleeved cylinders to 92 mm ... to make it a 2.8?

I haven't considered doing that, no! Would I have to shuffle-pin the case if I did that?

[Matt Holcomb]

Originally posted by Paul W:
Hi Matt

You may have already gone this direction but give Dennis a call at Aporschapart. He has great contacts both locally and O/S for all this sort of stuff. Second bet would be The 911 Factory, who always has all sorts of stuff around – if not a stocked item they might be able to point you in the right direction. May also be worth posting a request on the NSW Porsche Car Club Site, which is frequented by many racers.

Good luck

Paul,

The plan is to call Dennis (and contact the NSW Porsche club) if it proves to be too costly to buy pistons O/S.



[This message has been edited by Matt Holcomb (edited 08-22-2001).]

[Early_S_Man]

Matt,

Yes, it would need to be shuffle pinned, but so would your current plans, if the 280 hp figure is anywhere near accurate!

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

[Matt Holcomb]

Warren,

The last engine John Gregory rebuilt was a 2.4 for a rally-driving client, and after it left John's workshop, it was producing 273hp!

I guess I should believe him if he says that my 2.7 (2.6) will have an estimated output of 280hp. But I want to be sensible about this -- 240-250hp would be more than enough.

How expensive is it to have the crankcase shuffle pinned?

[Early_S_Man]

Matt,

It isn't expensive. Something around $200 at most shops that do 911 crankcases on a regular basis ... here in the states.

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

[Matt Holcomb]

Wayne,

$200, in the States? Well, that's not too bad. Thanks for that!

Btw, I'm having a tough time getting prices out of ARIAS and JE. I've e-mailed them, and I've even faxed them ...