944 Turbo Balance Shaft Cover Changes.
08-01-2016, 01:04 AM
#1
944 Turbo Balance Shaft Cover Changes.
Hey I was wondering if someone could fill me in with balance shaft cover identification. I know they made blocks with a 2 piece cover design and a integrated cover design. My question is which design is associated with which year blocks?
08-01-2016, 02:10 AM
#2
Drifting
From what I have seen with the 2.5 blocks the 83,84,85 have the integrated bearing. 85.5,86 have a none integrated bearing with a separate bearing cap just like the 87,88,89 but they have different size journals. And the 2.7 also has and integrated bearing. Never delt with the 3.0 blocks but if there like the 2.7 then they would be integrated also. Someone else will probably fill that info in shorty. And more then likely will correct my information if it's wrong, and maybe give the two sizes of bearings used and more specific changes made to the balance shaft covers.
08-01-2016, 08:22 AM
#3
See I have a scored 86 block that is torn down and has the 2 piece design. I'm looking at buying an 87 block, as my car is actually an 87 and it has the integrated covers? I was under the impression that pre to early 85 was the integrated cover and late 85 and on was the 2 piece design? I find it odd that my 86 is 2 piece and the 87 is one piece?. Seems like that would be a step backwards.
I'm interested in the bearing size change too as I'd like to use my 86 balance shafts if they are compatible in the 87 block. Was it a ID change or a width change?
I'm interested in the bearing size change too as I'd like to use my 86 balance shafts if they are compatible in the 87 block. Was it a ID change or a width change?
08-01-2016, 10:00 AM
#4
Drifting
That sounds like it's not an 87 block or it has early or 104mm block covers on it. What is the engine code stamped on the tab in the top rear of the deck of the block?your looking for m44/51. 87 uses different size bearings for there balance shafts/and balance shafts due to that. Also the oil pressure relief valve is a stock one piece design. And have an auto timing tensioner(block drilled to holed tensioner). Should be and aluminum tensioner.
08-01-2016, 08:00 PM
#7
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08-01-2016, 08:11 PM
#8
Rainman
Rennlist Member
Rennlist Member
my only guess is done for:
a) reliability reasons (can't see the nut on the early models coming loose under the cover, causing the b-shaft to flop around at 10,000rpm)
b) ease of manufacturing, only need to machine one part and bolt one part on rather than 2. less parts, less time = cost saving
a) reliability reasons (can't see the nut on the early models coming loose under the cover, causing the b-shaft to flop around at 10,000rpm)
b) ease of manufacturing, only need to machine one part and bolt one part on rather than 2. less parts, less time = cost saving