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I am trying to determine the deck to deck measurement for a oxyboxer conversion. I am trying to decide which case to use the Type 4 or Type 5, The overall width of the engine is important for the project I am working on.

Deck means nothing, unless you are planning on leaving it a short block.

Type-5 are type-1 width in mild builds, the type-4 is slightly narrower in mild builds. A typically converted type-5 is about half inch taller at the case deck, and depending on how wild, the barrels are shortened to make them same width in the end.

In my case it the deck size does matter, in order for me to determine what rod length I needed to know what the deck to centerline measurement is I have a very specific package I am trying to stick with. The deck to deck measure matters alot.

I'm pretty sure the deck height is 115 mm on a WBX and a type 1 have 100 mm. Cylinder can be shortend in the case end to compensate for the difference in deck height.

/Rolf

Thanks for the info

I am unaware of any drop in cylinders for a type-5, normally they are made from type-1 parts.

This is how much I shortened mine.

M-Owen wrote:In my case it the deck size does matter, in order for me to determine what rod length I needed to know what the deck to centerline measurement is I have a very specific package I am trying to stick with.
The deck to deck measure matters alot.

I suppose you need this info to figure out if you're going to have interference between your rods and the inside of the register of the bore?

Otherwise, case width has absolutely no effect on engine width.

Hey Rocky,

I thought that was you who answered I had not read your signature, I am using 95 mm 911 barrels, I think we talked about the rest of the set-up on the phone. What I am concerned about is rod length and exhaust packaging, All the dimensions are important and while I understand exactley what you are saying, I am very critical about planning and in this case overall the package.

Besides I have entirely convinced myself that the oxyboxer is the way to go. If you still have my number give me a call I want to send the case to you anyway for the removal of the waterjackets

Mark

M-Owen wrote:Hey Rocky,

I thought that was you who answered I had not read your signature, I am using 95 mm 911 barrels, I think we talked about the rest of the set-up on the phone. What I am concerned about is rod length and exhaust packaging, All the dimensions are important and while I understand exactley what you are saying, I am very critical about planning and in this case overall the package.

Besides I have entirely convinced myself that the oxyboxer is the way to go. If you still have my number give me a call I want to send the case to you anyway for the removal of the waterjackets

Mark

Sorry, Mark...I'm not Rocky; just another one of his customers.

The point I'm illustrating is that your engine width is dictated by your stroke, rod-length, combustion chamber deck-height and how much your heads have been flycut. That's it, nothing else.

As Sideshow demonstrated, the wider engine case means that you'll have to turn down the cylinders to accommodate the shorter case-to-heads dimension. For my 82mm stroke and 5.5" rods, we had to turn the cylinders down about 0.7". Unlike Sideshow's cylinders, I did not shorten the overall length of my cylinders, so I have a fair amount of the cylinder inside the case to support the piston at BDC.

Yup, my barrels are pretty short too, but they extend a Long way into the case.

Stripped66 wrote: Sorry, Mark...I'm not Rocky; just another one of his customers.

The point I'm illustrating is that your engine width is dictated by your stroke, rod-length, combustion chamber deck-height and how much your heads have been flycut. That's it, nothing else.

As Sideshow demonstrated, the wider engine case means that you'll have to turn down the cylinders to accommodate the shorter case-to-heads dimension. For my 82mm stroke and 5.5" rods, we had to turn the cylinders down about 0.7". Unlike Sideshow's cylinders, I did not shorten the overall length of my cylinders, so I have a fair amount of the cylinder inside the case to support the piston at BDC.