Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

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Freecirc
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Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby Freecirc » Fri May 09, 2014 10:58 am

I am finding that it is getting harder to find good performance parts options that don't cost an arm and a leg for the SAAB 900 these days.

I am in the parts accumulation stage for a rebuild and T5 conversion for my 1989 SPG. I bought what I thought were the correct performance pistons for my 900 from Wossner, but It turns out that those pistons were for the B205-E, F motor, and the Compression height of the piston varies by about an Inch! ( Might be willing to sell them to anyone here, if interested, If I can't swap them with Wossner for another, proper set)

However, I did see that Wossner makes pistons for the 2.3L SAAB 9000 still, and they look like they might work, height and bore-wise. If they can be used in my 900, then I can just swap what I have already bought and move forward. Any thoughts Fellow SAABer motorheads? Does anyone have the compression height specs for the 900 piston?

The Link to the 2.3L B234 SAAB 9000 turbo pistons:
http://www.wossneronline.com/product-p/ ... -turbo.htm

The pictures are from the set that I just bought that are for the B205-E, F

Thanks in Advance, friends!
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hutch
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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby hutch » Fri May 09, 2014 12:17 pm

First, I would step back and reconsider if you really need forged pistons for a c900. The OEM ones are very robust and can handle more power than would ever be wise to put through the transmission. If you're block is seized and you can't find another unit locally I could see rebuilding it while its all apart, but if you can find a junkyard around you that has one you can probably get a whole engine and transmission for the price of the forged pistons. Then just reseal it, maybe change pistons rings if you know the engine has a lot of miles but I would be tempted to just keep it all together as is.


With that out of the way... Check out this thread for some pictures and ideas about swapping around rods and pistons between the various generations of the B2xx engines over the years.

viewtopic.php?f=2&t=2019

I wouldn't really try to mess around with trying to put the 2.3 pistons in the block unless you can confirm with Wossner that they are the same. Your best bet would probably be to send them a stock B202 rod and piston and get them to make one in the proper size so you know 100% that it will fit your engine.

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby Freecirc » Fri May 09, 2014 12:42 pm

Hutch, thanks for your suggestions, I have read that Excellent post by Drew, and I do only live 20 minutes away from a good junk yard....

I do appreciate them, but I am trying to:
A) Recoup cost already spent by swapping a piston set with another piston set from Wossner that could work
B) Build an Engine that can handle extremes should I want to run it that way, and as efficiently as possible with stock-spec rods.

So, I really just want to know if I can use B234 pistons in my B202. Is the Compression height of of the B234 piston the same as the B202 piston, and can I use the B202 Connecting Rods? (I have already had Pauter build OEM-Spec connecting rods for me, so I cant change that either, sadly.)

I actually already have an email into Wossner asking about the exchange and if the 2.3L b234 pistons would work, but they may not know because the B202 is not in thier public catalog.

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby hutch » Fri May 09, 2014 2:21 pm

Take it with a grain of salt but a guy measured the b234 and b202 pistons and said they are practically the same:
http://www.saabcentral.com/forums/showt ... p?t=161608
Still probably wouldn't be a bad idea to send them a b202 piston if you have one sitting around to be 100% but it seems like you might be onto something if they would let you swap out the 205's for the 234's.

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby Freecirc » Fri May 09, 2014 2:47 pm

Yeah, I read that post too, and was a little unsure of the validity.
It is so darn hard to find specs for B202 piston heads on the inter-webs, ya know?
Maybe I just haven't looked hard enought yet... :-O

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby gmreider » Sat May 10, 2014 8:43 am

I was under the impression that the Wossner 2.3 pistons had a different deck to piston pin height. Wossner does make 2.0 pistons , but they can only be had thru Abbott Racing I think. I had looked into this last year when I was considering the same rebuild
I think the other issue was rod fit on the small end.

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby Luke » Sat May 10, 2014 10:18 pm

40.3 mm

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby Freecirc » Mon May 12, 2014 9:53 am

Luke wrote:40.3 mm


Luke, are you saying that the Compression Height of the OEM B202 piston is 40.3mm?

If so, then I am getting closer to using the B234 piston heads for my rebuild, as the Compression Height is the same between the B202 and B234! :yay:

If you are curious, Here is my source from on-line that shows a swedish guy using the Wossner 2.3L b234 pistons in a 2.0 b202:
http://www.mijnalbum.nl/Album=CZ4G4Y6T#ZLXBS7GF
http://www.saablink.net/forum/performan ... /52858.htm

Can you confirm that the wrist pin is the same for the B234 and the B202 as well?

Thanks Tons!

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby DrewP » Mon May 12, 2014 1:09 pm

Wrist pin diameter for all B2xx series engines are the same, regardless of 2.0L, 2.1L, or 2.3L displacement. The later ones like in T7 cars have larger thru holes and weigh less tho.
"You can educate ignorance, but you can't fix stupid."

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby Freecirc » Fri May 16, 2014 9:26 am

Awesome, Drew!
I thought that was the case, but was hoping that you or Luke would chime in and cornfirm.

Thanks for setting my mind at ease.

So, did you get your hatch fixed for the RallyCross this weekend?

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby Freecirc » Thu May 22, 2014 5:44 pm

Update. I have received my replacement set (for the second time) of pistons today. As soon as I get home, I am opening the box and verifying everything to be sure that B234 pistons will work withe the B202 Block and Connecting Rods (I bought Pauter Connecting Rods *ART*). I can already tell you that the B234 pistons made by Wossner have a slightly lower compression ration of 8.5:1, as they have a deeper dish in the piston head. Anyhow, here's hoping that they work :D

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Re: Wossner 2.3L B234 Pistons for SAAB 900 SPG B202 ???

Postby Freecirc » Thu May 22, 2014 8:17 pm

Freecirc wrote:Update. I have received my replacement set (for the second time) of pistons today. As soon as I get home, I am opening the box and verifying everything to be sure that B234 pistons will work with the B202 Block and Connecting Rods (I bought Pauter Connecting Rods *ART*). I can already tell you that the B234 pistons made by Wossner have a slightly lower compression ration of 8.5:1, as they have a deeper dish in the piston head. Anyhow, here's hoping that they work :D


Confirmed. Other than the dish of the pistons being a bit deeper (as expected), they are a perfect fit for the B202 connecting Rods/Engine. Thanks, Wossner. I cant wait to start the rebuild, and I am so glad I was able to save money by NOT buying the nearly twice as expensive Abbott Racing set made directly for the 900.

Happy SAABing!


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