Engine blocks and strokers
05-20-2011, 11:20 PM
#91
I asked them about the use of 944 sleeves and this was their response:
Are you referring to the 3.0L 944 block? People may have used our dry sleeves that are used in the 944 blocks in the 928. We have a head here with the block so we make the sleeves they will be made accordingly. The 3.0L sleeves are $800.00 for the set and include the 4 sleeves, o-rings, lubricant and sealer. The 3.0L kits are custom made to order.
Attached is a block spec of what the block is bored out to in order to fit the sleeves in the block. The stock cylinder casting is completely removed and replaced with the wet sleeve. Due to the limitations of the 3.0L block the largest safe bore size the block will go is 106mm. I will also attach a picture of the sleeves we use. The sleeves is sealed off with 3 Buna 70 o-rings on the lower register of the sleeve.
I have the images they sent me but Im not sure how to insert them into this post.
Are you referring to the 3.0L 944 block? People may have used our dry sleeves that are used in the 944 blocks in the 928. We have a head here with the block so we make the sleeves they will be made accordingly. The 3.0L sleeves are $800.00 for the set and include the 4 sleeves, o-rings, lubricant and sealer. The 3.0L kits are custom made to order.
Attached is a block spec of what the block is bored out to in order to fit the sleeves in the block. The stock cylinder casting is completely removed and replaced with the wet sleeve. Due to the limitations of the 3.0L block the largest safe bore size the block will go is 106mm. I will also attach a picture of the sleeves we use. The sleeves is sealed off with 3 Buna 70 o-rings on the lower register of the sleeve.
I have the images they sent me but Im not sure how to insert them into this post.
Did we ever find out about the Darton Sleeves? They would be about $1600 for a set of 8 plus machining and fitting. Good use for damaged blocks. They certainly look nice.
05-21-2011, 06:58 AM
#92
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Overbored 104mm cylinders may distort, getting unround, depending on smaller wall thickness. I have had this problem in other engines. Carl is drysleeving for up to 105mm bore. Is that an improvement in respect of strength? You guys having run overbored blocks for an extended time, what is your experiance?
Ake
Ake
05-21-2011, 12:05 PM
#93
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Join Date: Feb 2011
Location: Mostly in my workshop located in Sweden.
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In the late 80´s I had contact with a guy in Germany who wetsleeved the 928-block to 6 litre. Mahle 110mm custom made pistons. No stroker cranks were available in those days. He did the job almost exactly like the Darton sleeves, like Mike Simard and other does. It is vital the CI sleeves are supported at the top of the block otherwise we will see a heat expansion problem. The aluminum block will expand more than the sleeves causing the head gasket to blow. Nothing i new in this world.
Ake
Ake
05-21-2011, 03:23 PM
#94
Burning Brakes
This is the result of a wisco piston iron plated and a alusil bore . On a Devek supplyed stroker parts . eventualy the escaping compresion drove enough oil into the intake system to cause the final falure . this was a 5.8L engine with a scat crank .
