No money for MONOSLEEVE- But can i do THIS?

[GTV-GR]

I'm rebuilding a bigvalve T/S , Instead of buying a monosleeve , they cost freaky money, can i install the new sleeves and WELD them together on a few spots?

[Alfacliff]

I wouldnt, they would probably warp from the heat of welding.
cliff

[GTV-GR]

Cliff are you sure? The metal on those sleeves seems pretty fat, using a "medium" Mig setting for SOME penetration could it hurt that much?

[Alfacliff]

how much deformation could the cylinders stand? to get a good penetration, there would have to be quite a bit of heat penetration, unless you did it outside on a jig, and heated the cylinders then re bored them, it seems they would warp.
cliff

[ossodiseppia]

What purpose would welding the sleeve serve?

[GTV-GR]

The liners are quite motionless as it is from the factory, i'm not talking a high setting on the Mig ,a "surface" run on the "cool" scale. I mean you don't really need good metal penetration ,under still hellish conditions the liners would only move slightly ,if you have 3 "surface" welds on each liner side , i think the welds would hold back any minor movement under let's say a brief visit in the 8k area...

[Alfacliff]

it seems from pictures of the monoblock, the whole thing eas a lot thicker. also, there was no coolant between the cylinders.
like Osso said, why? the whole thing is extremely strong unless you use a lot of boost anyway.
cliff

[crashmctavish]

No!...............

[andyb6]

I think the chances of having the tops of the sleeves perfectly flat from front to back would be nearly impossible as well. By the time you welded them, re bored them, re-decked the head surface etc. the monosleeve will probably be similar money for a better product.

Andy

[genericwood]

Now if you could put a bead on them while they were torqued down by the head................????? But seriously, I have been told (by people I trust) that epoxying the liners into the block will add significant block stiffness on a very highly stressed motor.

Erik

[bianchi1]

epoxying the liners?

[PSk]

I would myself mill 10mm of the top of the block and make a 10mm alloy plate that fitted on top and was located by accurate dowls (and ofcourse the head studs), and a few tiny countersunk cap screws. This plate would be machined to locate the top of the liners, and yes the liners might need to be machined too a little.

Thus you would be effectively closing the top of the block like Ferrari engines, etc. You would also ofcourse have to drill a few water passage holes in this plate. It makes little sense that the top of the liner is allowed to walk around ... ofcourse the other option would be to machine a recess in the head to locate the top of the (longer) liners ... but that would be more complex and I doubt if the head has that much thickness, etc.

If I ever race a 105 series that is what I will be doing (ie. the plate to close the block) as I believe the monosleeve concept makes these motors much more reliable under racing conditions ... when making 200+ hp.
Pete

[raff_gta]

how much do these monosleves go for now days? and what about carbon fibre reinforcement like the Honda S2000?

[tomgtv6]

A lot of Honda racers weld them up but the blocks have alum. cast around the iron sleeve so they are welding an alum. deck to the aluminum. You realy need to weld cast iron hot. Iron is usualy put in an oven untill hot and while hot it is welded. The only way to really do it is to have a sacrificial block with the sides cut out so you could get in there to weld it; a little tack wont do any thing. Then you have to hope the bore spacing is exactly the same, the deck height ok, lip not warped, and level. It will probably need a re bore too. But may be worth it.

[genericwood]

Quote:

Originally Posted by bianchi1 epoxying the liners?