blade7

Considering the prices I'm being quoted for Mahle or Wossner Alusil compatible 104mm pistons I'm wondering about dry sleeving, so in the US what's a typical cost to buy and install dry sleeves including machining on a 104mm block ?.

refresh951

I dry sleeved a 2.5L block to about 102mm and it was about $120 per hole including the iron sleeve. I just tore down the motor after 1200 miles and sleeves looked perfect. Decking the block was another $100. This was on a half filled block that definitely improves cylinder stabilization. I would think a 3L block could use the same approach as the floor is higher than the 2.5L block and the cylinders are siamesed. This is a very low cost approach. Obviously there are dry sleeve approaches that cost a good bit more and have more documented history.

blade7

Wossner/Mahle pistons and a hone wont leave much change from $2k, I'm just wondering if properly installed sleeves and something like JE pistons would offer a comparable result for less money while being more robust.

V2Rocket

Do you have/would you share the specs on the sleeve you used? Darton wants over $1500 and 3 weeks to do the sleeving with a "944 specific 102mm sleeve". A company near me has a big catalog available...if I walked in with some of your pistons and rings and a block, would they be able to match one up (is it that generic a size?)

refresh951

I will get the details on the sleeve the next time I go over to the machine shop.

I think you need to find a shop that commonly sleeves aluminium blocks. The shop I used does it every day and they told me what I needed. I found this shop by talking to a really good Porsche mechanic that works at Auto Atlanta. I knew he did a lot of mod work on his 3L 914 and I asked him who did the work. It is a fairly small machine shop and the owner made his name offset grinding VW cranks 30 years ago. The owner can also be found drag racing most weekends. It is all about finding the right shop. I see it as a very important partnership, builder and machinist. If they cannot advise you what you need I would keep looking.

V2Rocket

Awesome! Thanks.

I have a scored 951 block and dead #2 bearing-crank here that I haven't been able to give away so I figure I could look into a stroker with them...

BisimotoSales

If you are looking for a cost effective option without sacrificing quality or design, we can help out with a set of custom forged pistons designed for either factory Alusil sleeves or aftermarket dry sleeves.

Bisimoto Engineering has spent many years working hand in hand with the engineers at Arias Pistons bringing new technology and innovation in piston design. With benched flowed crowns for improved flame travel, CNC machined from the highest quality aluminum to provide a lightweight design without jeopardizing integrity and have spent a countless amount of time working with piston coatings to improve effiency.

Bisimoto Spec. forged piston kits utilize ceramic coating on the crown to retain thermal energy within the combustion chamber and a moly-based coating to greatly reduce internal friction, while increasing piston life. From testing we have documented a 4% increase in horsepower and as well anti-detonation properties from these coating alone and a total of 8% gains over competitor shelf units.

Here is an example of a Bisimoto Spec. high compression race piston design.



- Julio

CyCloNe!

Fantastic, whats the price point for such pieces?

Reimu

bisimoto I noticed you had a fairly priced 911 coilover kit on your site

If you were to develop a good kit for the 944 crowd I'm sure it would sell well..

BisimotoSales

Pricing starts at only $809 including dome and side skirt coatings for 4 cylinder engines. 6 cylinder start at only $1,199. For more information feel free to reach us at 888-922-6686 or email sales@bisimoto.com

I am sure we will have something available very soon.

- Julio A.

333pg333

Rods?

blade7

Are the sleeves usually nikasil plated or plain iron ?.

rlm328

I had Darton wet sleeves installed. 2500 for sleeves and machine work. Do not believe the bs of 3 weeks. It took me 4 months and that was staying on top of them. JE pistons with carillo rods

blade7

Reading of George D's experience with JE I wonder if they have the correct oil rings yet ?.

rlm328

Rings are an art to fit properly. It takes a lot of time to do it properly. Of all the mechanics I have been around I would say I have met 3 true engine builders who truly understood how to fit a ring properly. I do not know George D and this is not a judgement on him. JE pistons have been around along time and they are a quality product.