Thanks for this information.There's no provision on the cjaa or cbea crankshaft for the tone wheel. Also the ALH Pistons will not fit the tapered end rods. You could use BRM Pistons. Or just find a BHW short block.
Thanks for this information.There's no provision on the cjaa or cbea crankshaft for the tone wheel. Also the ALH Pistons will not fit the tapered end rods. You could use BRM Pistons. Or just find a BHW short block.
if you can recall what tap sizes did you use?View attachment 112622
hole drilled....see the dimple deep in the hole? I ran into the water jacket and the dimple is the outside of cylinder #1 ...still enough material to tap
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tapping the hole with a bottoming tap
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because the stud wanted to bottom on the cylinder I had to grind off about 1 1/2 threads
View attachment 112625
using a feeler gauge throught the WP hole and checking between the stud and cylinder wall to make sure the tightened stud did not bind/deform the cylinder
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installed with loctite and tightened
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tapping the 7x1 holes for the ALH front seal holder
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holes completed
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ALH seal holder in place
Front cover is M7 x 1. I'm pretty sure the oil pressure feed is handled by a 1/8 pipe plug. The timing belt idler stud is M8 x 1.25if you can recall what tap sizes did you use?
thank you! will be doing this project this weekend!Front cover is M7 x 1. I'm pretty sure the oil pressure feed is handled by a 1/8 pipe plug. The timing belt idler stud is M8 x 1.25
I just realized I forgot that large roller hole 🥲 do you know the tap size for that?Front cover is M7 x 1. I'm pretty sure the oil pressure feed is handled by a 1/8 pipe plug. The timing belt idler stud is M8 x 1.25
Looks great! Larger roller hole should already be the correct M10 x 1.5 size. Edit; well damn, mine already had the correct hole there.I just realized I forgot that large roller hole 🥲 do you know the tap size for that?
If you look through my pics you can see the hole already drilled/tapped for the large idle roller. I had no idea that some BHWs did not have the hole there. Should not be a problem drilling/tapping but make sure the hole is precisely located as this can affect belt tension.I just realized I forgot that large roller hole 🥲 do you know the tap size for that?
yeah I was looking through the thread and couldn't find info on the large roller. I was bummed when there wasn't a hole lolIf you look through my pics you can see the hole already drilled/tapped for the large idle roller. I had no idea that some BHWs did not have the hole there. Should not be a problem drilling/tapping but make sure the hole is precisely located as this can affect belt tension.
I don't have the Piston projection measurements on hand but any Bentley Passat b5.5 TDI manual should provide that spec.Jimbote I finally about to embark on this and my BHW shortblock is missing its original headgasket so I am unsure if it was a 1,2, or 3 hole headgasket. Any info on what to use or what quinch measurement to find out?
Did you get the hole drilled/tapped?I just realized I forgot that large roller hole 🥲 do you know the tap size for that?
yessir had to get the ip and everything on so I could measure it more precisely. So far so goodDid you get the hole drilled/tapped?
Thanks found it. Deck piston projection needs to fall between .91mm and 1.20mm. 1 hole gasket is 1.45mm. 2 hole is 1.53mm. and 3 hole is 1.61mm .I don't have the Piston projection measurements on hand but any Bentley Passat b5.5 TDI manual should provide that spec.
Ok, but aren't those just compressed gasket thicknesses? How does each correlate with different projections?Thanks found it. Deck piston projection needs to fall between .91mm and 1.20mm. 1 hole gasket is 1.45mm. 2 hole is 1.53mm. and 3 hole is 1.61mm .
Im gonna assume the same methodology of other gas builds Ive done and look at what the protrusion spec is and what is available from the factory in this case.Ok, but aren't those just compressed gasket thicknesses? How does each correlate with different projections?
Looking at Elring gaskets on rockauto. One hole is from .91mm to 1mm. Three hole 1.11mm to 1.2mm ... No two hole listed (probably out of stock), so I'm assuming it's for projection of 1.01 to 1.10.Im gonna assume the same methodology of other gas builds Ive done and look at what the protrusion spec is and what is available from the factory in this case.
I havent confirmed it exactly but I am going to assume undecked head that you want a min .41mm to max .54mm deck projection minus gasket thickness. Also those are BHW numbers and slapping an ALH head on there will lower the compression slightly. Ive got some more digging to do but its safe to say staying right around .50mm difference will be fine.
Also ,iirc, the ALH head does not drop compression. The BHW piston's larger bowl lowers the number.Im gonna assume the same methodology of other gas builds Ive done and look at what the protrusion spec is and what is available from the factory in this case.
I havent confirmed it exactly but I am going to assume undecked head that you want a min .41mm to max .54mm deck projection minus gasket thickness. Also those are BHW numbers and slapping an ALH head on there will lower the compression slightly. Ive got some more digging to do but its safe to say staying right around .50mm difference will be fine.
You are correct the piston bowl drops the CR not the head. Assuming a undecked ALH head of course should be close to spec as a hybrid block can be.Also ,iirc, the ALH head does not drop compression. The BHW piston's larger bowl lowers the number.
Hy, you know if i can do thisthanks! the BEW piston tops are flat, so you could if you cut valve reliefs as A5 stated or you could replace the BEW pistons with BRM units
Hy, can i do this conversion, alh head in to a bwd 2.0 pd, jeep patriot 2008 fabrication ?thanks! the BEW piston tops are flat, so you could if you cut valve reliefs as A5 stated or you could replace the BEW pistons with BRM units
Yeah we did it on our pulling tractor engines and Big Block Mopars.Interesting thought on the offset grind. I would think with a set of custom ALH journal rods it should work. Personally I'll take a stronger crank though. I believe with a good turbo/ injector/ tune setup any gains from the displacement increase would be slight. Where I have more commonly seen this done is on naturally aspirated engines that have no replacement for displacement.
It would be funny. I still call the BHW a "big block"Yeah we did it on our pulling tractor engines and Big Block Mopars.
Here it would just be funny to say you had a 2.2 stroker
Couldn't you just keep the stock length rod and move the pin position with custom piston?Run the numbers...you get the difference in journal size extra stroke, and rod needs to get half that shorter. It is another .1 liter or so, but I probably did it on an ALH bore...LOL
These don't spin fast enough for the smaller journal to be worth the strength cost.
Nice idea with the GTD/VRK...
Douglas
I think/thought it a wee bit easier to get custom rods than custom pistons. For a stock or 0,25 overbore on an ALH, I think it hard to beat ARL pistons. Same basic conclusion for the OEM BHW pistons( either stock or standard overbore sizes ). I have not confirmed this, but I think getting galleried, steel ring land pistons would be lots worse than a set of rods of custom length. Taking a forging and cutting c-c length and journal ID's sure looks less complex in The Land of Small Production.Couldn't you just keep the stock length rod and move the pin position with custom piston?