ChrisJ951

Hi All,
Quick question. Since my #2 cylinder is cracked, I'm wondering if I can just wet sleeve the motor? From what I understand, wet sleeving a motor with Darton MID sleeves basically replaces the stock sleeve? Am I correct. Please let me know.

Thanks,
Chris

fortysixandtwo

These motors are not sleeved from the factory. If you currently have a sleeved motor, that means they have been added at some point. If this is the case, it would actually be beneficial, since you can just press the old sleeve out and replace it with a new one.

In addition to a wet sleeve, you can dry sleeve as well. With a wet sleeve, some or all of the original bore tower will be machined away, with the sleeve to block joint being exposed to the water jacket. A dry sleeve does not expose any sleeve to block joints to the water jacket.
Personally I like dry sleeving.


Edit:
For some reason I glanced over the cracked cylinder statement. Wet sleeve or replacement block would be the only options. I don't know how good of an option doing just one bore tower will be. Depending on piston compatibility, you might have to do all of them.

67King

To the OP, not sure if you saw my post in a prior thread or not, but just in case, I've got a block that needs to be bored (honed), but is otherwise good. I wanted to think you were getting a block from Lart, but if you aren't, you can have mine, I was going to just scrap it. Just throwing out another option.

87944turbo

Some pics that do a great job of illustrating the basics of the wet sleeving process.

ChrisJ951

67 King, I did get a block from Lart, thanks thought.

I would wet sleeve all cylinders not just my cracked one. I was just wondering if wet sleeving would work, which you have answered, it does.

Chris White

Or you could look at http://www.944enhancement.com/html/e...machining.html for a nice write up and some more pictures of the machining.

doabarrelroll

I went the dry sleeve route and here are some pics of my motor being built.





You can see the difference between the block and the sleeve itself.

944J

a little off topic, but what's the biggest bore wet sleeve you can install in the 2.5L engine and in the 2.7L/3.0L block of an 944, S2, 968? has anyone done a wet sleeve 944?

Chris White

2.5l = 104mm
3.0l = 106mm

944J

JMG bored the 944 to 108mm for 3.2L... is this the biggest that's been done?

http://www.jmgarage.co.uk/CMS/index....e-944-32-turbo

coilbox

Can you bore a 2.5 block to 106mm and leave the stock head, or it needs a 2.7 head?

Adonay

Would be better to bore a 3l block to 106mm and machine a 2,5l head to fit the block in my opinion if you want to use your 8v cylinderhead.
No mather what size you bore a 2,5l block the 2,5l head will fit.

coilbox

Maybe I didn´t explain myself.

The 2.5 head has a 100mm combustion chamber, if you bore to 104 o 106mm, are there any issues in leaving a "small size" head?

I know a 2.7 head can be fittted to a 2.5 block, but is it necessary or just better for performance?

Adonay

The way i have been told is that there are differences between the water passages in a 3l/2,7l block and the 2,5l blocks my mechanic seems to think that the 2,5l head works fine on his 3l block with out doing anything to the combustion chamber. He only machined the water passanges . But its a interesting question.

Thom

For a build using bores larger than either the stock 100mm or 104mm sizes I would probably look into modifying the quench area on the head.