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Old 11-20-2007, 08:44 PM
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Paul Spruell-an Australian that makes 90mm liners-need answers

Paul Spruell has agreed to help with my stroker engine (Piston and rod design-rods to be 2mm longer instead of shorter-more torque baby!) and has advised me that there was someone in Australia that made 90mm bore liners. Does anyone know where I might be able to find this gentleman??
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Old 11-20-2007, 08:56 PM
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DDoug, I suspect Paul was referring to a company called Beninca. They make a monoliner, although I didn't realize it allowed them to get the bore to 90mm. That's a really big hole. If I'm not mistaken the monoliner (including piston oil squirters is nearly $5,000).

Erik
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Old 11-20-2007, 09:01 PM
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Quote:
Originally Posted by genericwood View Post
DDoug, I suspect Paul was referring to a company called Beninca. They make a monoliner, although I didn't realize it allowed them to get the bore to 90mm. That's a really big hole. If I'm not mistaken the monoliner (including piston oil squirters is nearly $5,000).

Erik
He didn't say and couldn't remember a name, other than "someone in Australia makes a 90mm liner that would help get the displacement you're looking for". As for the crank, yes, found a machine shop who will lighten it, stroke it, balance it and re-nitride it. The rod ends need to be clearanced for the extra stroke I'm looking for and to run 17psi of boost, the pistons can be flat toped-to dished-if need be. But the numbers add up, just need to know where I can locate these 90mm bore liners.
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Old 11-20-2007, 09:09 PM
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A 2.3l? And with 17lbs boost!!

Dibs on breaking in the engine.
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Old 11-20-2007, 09:12 PM
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Beninca, as genericwood suggested Machining capability
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Old 11-20-2007, 09:15 PM
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Quote:
Originally Posted by papajam View Post
A 2.3l? And with 17lbs boost!!

Dibs on breaking in the engine.
A 2.3? Think bigger-the crank is going be to stroked too
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Old 11-20-2007, 09:17 PM
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Originally Posted by OZe View Post
Beninca, as genericwood suggested Machining capability
Thanks for the link, I'll have to call or email to verify the 90mm bore-Thanks OZe!
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Old 11-20-2007, 10:34 PM
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For special cylinder liners, I'd recommend Westwood in the UK. They handle bore sizes up to 5.300" and have no minimum order - that enough for you?!

I'll follow this thread with interest ....

Alex.
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Old 11-21-2007, 04:08 AM
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For special cylinder liners, I'd recommend Westwood in the UK. They handle bore sizes up to 5.300" and have no minimum order - that enough for you?!

I'll follow this thread with interest ....

Alex.
Thanks for that link, the monoliners did not get up to 90mm.
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Old 11-21-2007, 05:20 AM
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Quote:
Originally Posted by ddouglas77 View Post
Thanks for that link, the monoliners did not get up to 90mm.
This is weird - my turbo Alfetta had OS liners (not as big as 90mm!) and forgies to suit (Arias) when I bought it. It has been causing me no end of grief trying to get/bore OS liners and end up with something strong enough/something that would stay round and sealed, so I eventually ditched the pistons and went with std bore low comp JEs from Paul Spruell (and a set of original Autodelta turbo liners which - dare I admit it - I had the cooper ring retaining protrusion machined off). Paul was out of ideas for OS liners and was very doubtful about trying to get them to work under boost especially. I can't see how you could go to 90mm - offset bores maybe? Serious headwork too? This is all very scary stuff - hope you have very deep pockets!

Very interesting idea/serious bit of engineering - will be very interested in what you come up with!
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Old 11-21-2007, 09:25 AM
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when i use to live in altanta - i loved going to paul spruell when he had his alfa dealership. i guess the race car business is much more profitable for him then the repair side.
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Old 11-21-2007, 12:02 PM
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An interesting thread, leading to a few basic comments:

1. Have you ever seen an Alfa 4 cylinder engine disassmbled?
2. The difference between 84 mm (stock) and 90 mm is .236 in. Assuming you had 90 mm liners fabricated, how do you propose to fit these into the block, to accomodate the existing crankshaft rod bearing spacing, and to provide sufficient space for the O-ring seals ?

Quote:
Originally Posted by ddouglas77 View Post
Paul Spruell has agreed to help with my stroker engine (Piston and rod design-rods to be 2mm longer instead of shorter-more torque baby!) and has advised me that there was someone in Australia that made 90mm bore liners. Does anyone know where I might be able to find this gentleman??
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Old 11-21-2007, 02:07 PM
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Quote:
Originally Posted by conedriver View Post
An interesting thread, leading to a few basic comments:

1. Have you ever seen an Alfa 4 cylinder engine disassmbled?
2. The difference between 84 mm (stock) and 90 mm is .236 in. Assuming you had 90 mm liners fabricated, how do you propose to fit these into the block, to accomodate the existing crankshaft rod bearing spacing, and to provide sufficient space for the O-ring seals ?
I have help from Alfa friends to get this sorted out, if nothing else, will remain stock LENGTH rods and stroke even further to get to the 2.5L status. Yes it does seem an old VW flat four was easier to stroke and bore out, even though it's liners were air cooled instead, but machining the block to handle big liners could be done blind folded. Again, I'll have to rely on someone with this proven experience before any wallet depleting things are done.
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Old 11-21-2007, 02:09 PM
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Quote:
Originally Posted by lgbalfa