Alusil refinishing ?

[blade7]

I understand the honing/lapping process and I'm interested if anyone has had an Alusil block successfully honed and by who in the UK ? Capricorn, Serdi, and Hartech don't seem interested, so any other suggestions ?

[LarJammer]

if hartech say no then its probably not viable anymore. however i believe porsche have started remaking engine blocks for 944's again. istr they were around the 2k mark which i think is reasonable value.

[Boosted LS1]

I have the hones and polish and have done several 944 blocks. Thing is, if the blocks badly scored it needs relinering and I don't do that. If the blocks within service limits it can be refinished and new oversized rings supplied.

[blade7]

LarJammer said:

if hartech say no then its probably not viable anymore. however i believe porsche have started remaking engine blocks for 944's again. istr they were around the 2k mark which i think is reasonable value.

Where did you hear about Porsche remaking the engine blocks ?

[LarJammer]

blade7 said:

Where did you hear about Porsche remaking the engine blocks ?

there was an article in a recent porsche mag.

[Cheburator mk2]

You can contact Sutton Rebore in Sutton - they have done 928 blocks in the past. However, as Lusifer says, if its beyond what is available as oversize - 100.5 for the 2.5 and 104.5 for the 3.0 then you will have to sleeve it.

Personally, I have had it with alusil and sleeved the Turbo with Woessner pistons and dry Westwood liners. And yes, Porsche are making the 2.5 and 3.0 blocks again. You can actually have a complete short block for about 5k... or just the block for 2k

[blade7]

Are Sutton still trading ? If a new 968 block with piston oil squirters and the crank girdle and balancer shaft covers is £2k I'd consider that route.

[GavinPearson]

Take a look at this.

The information is very useful.
http://download.ms-motor-service.com/ximages/ks_50...

This is also probably of interest...
http://www.ms-motorservice.com/fileadmin/media/msi...

Edited by GavinPearson on Sunday 1st March 23:00

[blade7]

I had seen that, thanks though.

[Cheburator mk2]

blade7 said:

Are Sutton still trading ? If a new 968 block with piston oil squirters and the crank girdle and balancer shaft covers is £2k I'd consider that route.

I have found Porsche parts desk in Reading most helpful in the past. Ask for Kelvin - he is trade parts, but would deal with enthusiasts. As for Sutton - no idea - I got my block sleeved by an Mercedes/AMG authorised place in Europe...

[westwood35]

I would try Serdi UK. We have sold them a number of 104.00mm Wet liners in the past few months. They seem to be doing a fair number at the moment.

[blade7]

Emailed Serdi a couple of times, no reply. Dry liners are what I'm considering, can you supply them nickel ceramic plated ?

[westwood35]

I have spoken to Serdi this morning and they have not seen your email. They can alusil your block or fit our liners. We do not provide coatings on our liners. Use the email on the Serdi website.

[blade7]

westwood35 said:

I have spoken to Serdi this morning and they have not seen your email. They can alusil your block or fit our liners. We do not provide coatings on our liners. Use the email on the Serdi website.

Thanks for mentioning this to Serdi, it was a few months ago so perhaps it got overlooked. I want to have the pistons in hand before I have the block refinished but I'm having issues sourcing the Wossner custom pistons at the moment.

[Pumaracing]

A quick heads up and an FYI to Messrs Westwood as I see you posting in here. Last year I built a Peugeot Mi16 alloy blocked race engine up here in Aberdeen for a friend using a set of your 83.5mm liners. As you know these seal in the block against a 1.3mm diameter O ring which crushes into the triangle between the corner of the liner and a 45 degree chamfer in the block - something like this shape L\.

The standard liner has a very specific radius in that corner, quite a large one, which takes up some of the volume and generates the correct amount of crush on the O ring. Your liners have an almost sharp corner there which means more space for the O ring to sit in and the liner pretty much sits flush down on the block surface before contacting the O ring and sealing against it properly. Luckily the problem was spotted during a dummy build and some larger 1.5mm diameter O rings sourced online resolved it. You might want to have a closer look at the geometry of this area and modify your machining accordingly.

[blade7]

Are the liners also fixed into place with a Loctite solution ?

[westwood35]

As far as i know, Serdi would fit the liners with an interference fit.

[Cheburator mk2]

blade7 said:

Are the liners also fixed into place with a Loctite solution ?

The liner is interference fit and is also TT shaped with the flange on top. The block gets heated to approximately 200dec C, the liner is chilled and then it slots in. When both are cold, the block is decked. Zero chance of the liner going anywhere, especially that the Westwood liner comes longer and is cut to size before it gets inserted. I have used Westwood twice and so far I am happy to report zero problems with them. Btw, I would recommend Carl from Racer's Edge in California for getting custom Woessners.

[westwood35]

Great explanation....do you want a job!! Exactly correct and in our opinion you should not use loctite unless for specific issues. Another satisfied customer.....

[blade7]

Cheburator mk2 said:

The liner is interference fit and is also TT shaped with the flange on top. The block gets heated to approximately 200dec C, the liner is chilled and then it slots in. When both are cold, the block is decked. Zero chance of the liner going anywhere, especially that the Westwood liner comes longer and is cut to size before it gets inserted. I have used Westwood twice and so far I am happy to report zero problems with them. Btw, I would recommend Carl from Racer's Edge in California for getting custom Woessners.

AFAIK The liners are usually cooled in liquid Nitrogen, the block heated in an oven. The liners should be held down during the cooling phase to prevent them moving upwards. I've spoken to Karl a few times but unfortunately Wossner have told him not to supply to Europe now .