Rokket

I am looking for a group "buy in" to rebuild Porshed 911 Carrera 3.4/3.6 engine case remans. It takes awhile to set up, so we can set up and do a bunch of them at a time for a discounted rate.

If we can get about 5-sets of cases per run, we can get them remanufactured for about $1650 per engine.

These Rokket Race sleeves have been in my 951TS for 2-Sebring Enduro Track Records.


Here are some of the benefits:

1. Cast iron performance in an aluminum block
2. Improved block integral strength
3. Improved cooling
4. Kits can be installed by your local machine shop
5. Custom Displacement & Compression Options
6. "Wet sleeve" replaceability and Repairs
7. Increased horsepower output potential
8. High boost and horsepower potential
9. Superior oil and compression control
10. Superior cylinder sealing and ring wear
11. Street or strip application
12. Bulletproof Darton ductile iron, 130,000-psi tensile strength
13. Precision Machined and Press Fit
14. Aluminum Engines (Nikasil/Alusil) are more Robust and Reliable
15. Unlimited Piston Aftermarket Piston Options (Wiseco, Wossner, JE)
16. Easy to Replace for Future Repairs/Overhauls
17. Custom Piston to Wall Clearances available for performance
18. Porsche Stock Piston Set costs $4100,
19. Rokket Engines Performance 3.6L Piston Set $1199
20. Save $3K over Stock w better Components!
21. Precision Machined with materials and tolerances for the Ductile Iron conversion in Aluminum Engine

Chris(MA)

Can you explain what process you do to the blocks?

I can't quite tell from the pics, but it looks like you bore/ream out the cylinders and press fit some kind of steel or iron liner with a top retaining lip?

dporto

Quadcammer

you must be a sponsor right? You couldn't possibly think of setting up a groupbuy for your products on here without being a sponsor, could you?

tekkie

if you have proof that its in fact bulletproof and I can put a supercharger /turbo on a 3.4 and use high boost I will be in quickly ... but i am skeptical from everything i have read about these engines

strathconaman

Subscribed for the fireworks.

Quadcammer

The cylinders are only one of a dozen issues with this motor. Its hardly the final solution.

5CHN3LL

Every time I see someone else rebuilding M96's, it makes me happy. Sure, there will be pecker contests, but it's still a good thing for the ecosystem.

george_west

This doesn't look like a wet sleeve. Looks like dry sleeve.

Chris(MA)

+1 on more people giving us more options for the m96/m97 motor.

Dunno if anyone else has seen the guy on the 964(?) forum who started a business making brand new upgraded cases for the 3.6 air cooled motor. Very impressive but expensive to do.

Be awesome if someone did the same for the m96/m97, perhaps allowing it to use the off the shelf mezger wet liners from the turbo/GT3

After digging around on the interwebs, I found this post by the owner of a UK company that manufacturers liners, they supply for m96/m97, interesting he mentions the technicalities of correct fitment/process to success:



"My name is Duncan Andrews and I am the owner of Westwood Cylinder Liners. We supply cylinder liners for a wide range of engines, including the water cooled Porsche engines.

We were made aware of the problems that the 6 cylinder water cooled engines were having about 4 years ago, and customers were buying our universal repair liners which had suitable dimensions for 96.00 and 99.00mm bores. Within a year or so we were asked to produce a specific liner for each engine (less cutouts and holes).

These second generation liners have sold in their hundreds, and led us to produce a Ductile Iron liner which has all the cutouts and holes machined for each individual cylinder. We have sold these all over the world and have one particular customer in the UK who has at least 6 sets a month.

Cast iron liners have been used in Aluminium engines for many years, and continue to do so. Look at all the American V8 engines that are aluminium with cast liners. The fitting of the liner is the most important thing, generally involving liquid nitrogen and a suitable oven! This is the important point with regard to the liners. There is a specific way in which the blocks need to be machined, then the liners need to be fitted in a certain way, and of course final finishing after fitment.

I have no issue with what Hartech do with their engines, and it is a solution that works. BUT, cast iron liners in these crankcases work as well, and as pointed out are considerably cheaper. I have a reputation to keep with my business, and would not sell a product that was "not fit for purpose" We have reacted to market requirements, and acted accordingly. In all the time we have been selling these liners for the water cooled Porsche engines, no one has come back and said they do not work. We have over 25 companies in the UK that use the liners, and they keep coming back for more!! Our sales are increasing month on month and we expect this to continue. I do know of companies sourcing liners from other suppliers overseas, so cannot make comment on the quality of their cast iron products. I know our product, and am fully convinced it is suitable for job. It is also fair to say that the sales of these liners within our business make up for less than 2% of our overall turnover, so we are not doing this to make huge profits, its because our customers have asked us to produce them.

We will continue to sell our product and keep up with the ever increasing demand from our customers for the cast iron liners. We do not fit the liners, but we can highly recommend a number of Porsche specialists and engine machinists that work on these engines on a regular basis. Some of these are well known companies, that have seen the benefits of the cast iron liners. Please contact us directly for more information.

We will not discuss any technical information or fitting requirements on any forum or webpage, because once its on the internet its there forever!! We work by talking to our customers on the phone or face to face. There is no hiding behind a screen and you get to ask all the questions you want.

Hartech has mentioned "the legal position". I have spoken with my lawyer this morning, and we are quite prepared to take further action with any company that continues to make comments about my company, that are blatantly not true. If anyone has an issue, including Hartech, then pick up the phone and talk to us. In our world this is how things are done. Might be a bit old school, but you will get a straight honest answer and you can then make your own decision.

I hope now that certain people will accept that there is such a thing as competition!! Some may not like that fact, but it is life."

Turbojamie

I like what I am seeing here, many engines running around with steel sleeves in them. Nothing to fear here despite what some of the fear mongers will post. Looks like an excellent alternative to the expensive nikasil cylinders some of the others are peddling. Steel cylinder liners are well proven in the world of engines and there is absolutely nothing to fear with them.

TonyTwoBags

If you google wet liner there are quite a few reputable, remanufacture operations throughout the Southwest.

george_west

Please correct me if I am misinformed, but the only examples of a failed steel/iron sleeve that I have seen are due to improper installation, parent material cracking or sleeves sinking or dropping.

Critics of steel/iron sleeves will say it won't transfer heat as well, or it will expand at different rate, but have these issues resulted in a failure? LA Sleeve claims that have sleeved thousands of these engines. If their claim is even close to reality, wouldn't we have heard about failures by now? They must have at least sleeved enough m96/m97 to make them a catalog item.

Quadcammer

how do you figure? The sleeves are nearly fully open to the coolant

george_west

The original aluminum is exposed to coolant, not the cast iron. The cast iron is inside the original cylinder.