Eric_Oz_S2

I haven't yet got to the bottom of my engine failure as I'm in a different country, but I'm working out my options depending on what is wrong.

Assuming a bottom end rebuild is required, it seems there are the following options

1. Nikasil coating (if no deep gauges) with or without rebore and
New pistons
2. Sleaving with new pistons
3. Used engine
4. New Porsche short block

Option 1 could be around 3k plus additional time and labour for assembly.
Option 2 closer to 4k+ assembly
Option 3 perhaps 1.5 k ?
Option 4 $4.5k

Option 4 comes fully assembled. Haven't checked actual availability but that is the list price.

So, there seems to be a slight cost penalty getting a new short block, but I gather this comes with everything below the head gasket - new pistons, rods and crank. I presume there is no core charge for this and it is a new engine, not rebuild. Anyone know for sure?

So why not just get a new engine. I have never read any posts on installs of new engine, so what's the catch?

Cheers

Dougs951

IIRC the short block is NLA

refresh951

I would go Hybrid Stroker.

Paulyy

Being in Australia and not having the same guys who did yours and sids crank, it kind of makes it a slight issue.
Not saying our machine shops are not capable, we just don't have many with 951 experience

refresh951

Duke found a shop to do his offset grind, really just need a machine shop with crank experience in this area. My machinist does not have much 951 experience but had done a lot of VW offset grinds.

xtaC

There should be plenty of places in Brissie that can handle an offset crankshaft grind.

I would try Crankshaft Engineering, in Browns Plains. I have had personal experience with them, and my 951 Crankshaft (I had it lightened and checked over).

Mendhams in Brissie is also pretty good. An offset grind is a pretty standard operation on any crank.

blown 944

It's a pretty easy process. especially if you also turn the mains. That is the only trick compared to trying to keep them std. Just have the rod pins ground to mitsu spec with .002 clearance.

You can do a 3.3 with a 3.o base pretty easily.

86 951 Driver

3.0 Engine failure? Is that very common? It seems these bottom ends are just not built for the track.

Eric_Oz_S2

Wow, we've gone off on a bit of a tangent. I have a 3.0 S2 engine, so need to stroke that further. I suspect the failure is more likely in the cylinder - the crank (I hope is OK). Symptoms were blown coolant and oil and a lot of loud rattling from top of engine. No compression on Cyl 1 and oily plug, lots of blow by through crankcase oil fill.

Are we sure that S2 blocks are NLA? I might ring around and find out about that one.

Is there really anywhere in Oz that can Nikasil plate or rebore Alusil blocks with experience?

The other option is wet sleaves and over bore to 3.2L.

333pg333

Eric, were you at Rennsport and if so, is that where you did the motor? I was out there pretty early Sunday morning. Sorry not to have caught up.

There's a guy in Sydney who does the proper Alusil honing. New pistons and honing would cost around $2k.
Just a thought.

Paulyy

The hybrid stroker would be a good idea IMO because the only reason is that the bottom end bearings will hold up better at higher RPM. And you'll have additional torque to your bottom end. And it's cheap.

blade7

Sorry for editing your post but cheap relative to what ?. As I've got a spare 2.7 engine and an S2 crank I'm undecided whether to go conventional 3.0 or offset ground on either the 2.7 or 3.0 crank.

Paulyy

Quote from Shawn:
Remember pistons and rods for a 951 alone is 2k then bearings, re bore if needed ect. gets very expensive.

blade7

Thanks for the link, I costed a conventional 3.0 bottom end around £3-4k depending on spec which is around $5-6k I think, if a hybrid is cheaper and stronger I'm in.

mikey_audiogeek

Hi Eric, sorry to hear about your engine. You could try www.nzcylinders.com (no affiliation of experience with them)

Cheers,
Mike