17 replies to this topic

[nollyd]

Hi all,im in the process of stripping a 1098 a+ engine,have decided the crank needs regrind,and maybe have bores done in block,how will this affect power etc,do i need to replace pistons.how much oversize should i go in bores.and are there any other reccomendations to do while engine is stripped.putting new oil pump etc in.

[nollyd]

Also does anyone know to a macine shop in walsall area and approx cost of rebore and regrinding.

[Steve220]

Re-bore = new pistons and rings. Go to the next size up, which is usually +20.
Crank grind = new bearings.

[Steve220]

Replace oil pump, water pump and all gaskets/seals as a minimum. You'll have to pull the gearbox off so worth checking that over, primary gear wear etc

[Steve220]

Southam Mini and metro centre are the other side of brum. They did my engine.

[nollyd]

Cheers Steve220,its all stripped,just cleaning up at the mo,yes new bearings etc will go in.

[Steve220]

I wouldn't bother cleaning it up. Any engine builder worth their money will have to acid dip it anyway.

[blacktulip]

I always say go to the next size so you can maximise the life of the block.

[Spider]

In checking on Machine Shops, ask what type of machine they have for doing the Crank Grinds. If it's a Prince, run like hell.

 

These are a weird grinder that follows exactly the journal that's in the crank, only, it will make it round again. So, if there's any error in the journal's location, which 90% of the time there is, it will leave that error in the crank. These appear somewhat popular in the UK as they are a cheap machine, take up little floor space and are fast to set up.

 

Look for a shop that has an off-set type Crank Grinder.

[nollyd]

All great advice,thanks all.the bores on the block are not scored or damaged,they have a very slight lip at the top of the bore,whats your thoughts on that please.

[Steve220]

All great advice,thanks all.the bores on the block are not scored or damaged,they have a very slight lip at the top of the bore,whats your thoughts on that please.

Rebore +20.

[nollyd]

Ok,so +20 thou,crank regrind new bearings etc,is it new pistons and rings or just rings?. Also when checking the gear box over i need to check gears,teeth,bearings,shafts etc,now the baulk rings,when the ring is engaged what gap should i be looking for.

[dyshipfakta]

Your going to need bigger pistons

[G'Racy]

You could try Bromsgrove Engine Services, short trip down the M5 from where you are.

[timmy850]

And you will need to get them to check the bore first before you order anything. Maybe the block is already oversize and you need to go to +040 from stock, or possibly the block won't clean up at the next bore.

 

Same goes for the crank bearings/journals