Engine casing discrepancies
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wrote on 12 May 2020, 11:32 last edited by
Is it normal for two casings to be different? Specifically the inlet porting? The right side case doesn’t match the left by about 8mm! It’s an old 3bn that I don’t know the history of (eBay). I’m guessing that they two different year casings.
Is it best to match them or is it normal?..
Cheers -
wrote on 12 May 2020, 11:46 last edited by
Yeah, they aren't well matched out the factory are they
There is a lip on the cases at the inlet. But they are fine everywhere else.
I presume this was done for a reason.
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Is it normal for two casings to be different? Specifically the inlet porting? The right side case doesn’t match the left by about 8mm! It’s an old 3bn that I don’t know the history of (eBay). I’m guessing that they two different year casings.
Is it best to match them or is it normal?..
Cheers -
wrote on 12 May 2020, 14:47 last edited by
Just to embellish a bit. These are 3BN 01 cases. I have some 3BN 03 cases that are totally different. The inlet port that ‘ups into the barrel’ doesn’t have the step, but does have a ‘flaired up step’ that I guess directs gas flow up into the barrel port. I’m just wondering how many different variations of 3BN engines there are?
I’m guessing that the 01 & 03 numbers are the year?
Cheers guys -
wrote on 12 May 2020, 15:15 last edited by
Sorry! The ‘flaired up step’ is just above the crank. Not a step in the casing. It’s more like a spoiler or a ramp...
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wrote on 12 May 2020, 15:24 last edited by Calum 5 Dec 2020, 16:39
A picture says a thousand words...
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wrote on 12 May 2020, 19:19 last edited by
I agree! The bits I’m on about are internal though
How do you post upload pics from a phone. Do you still need to host the pic?
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I agree! The bits I’m on about are internal though
How do you post upload pics from a phone. Do you still need to host the pic?
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Is it normal for two casings to be different? Specifically the inlet porting? The right side case doesn’t match the left by about 8mm! It’s an old 3bn that I don’t know the history of (eBay). I’m guessing that they two different year casings.
Is it best to match them or is it normal?..
Cheerswrote on 24 Oct 2020, 13:32 last edited by SpookDog@SpookDog said in Engine casing discrepancies:
Is it normal for two casings to be different? Specifically the inlet porting? The right side case doesn’t match the left by about 8mm! It’s an old 3bn that I don’t know the history of (eBay). I’m guessing that they two different year casings.
Is it best to match them or is it normal?..
Cheers
I know it’s an old post, but I’ve only sussed out pics recently. Check out the casing join inside the inlet!...
What say yooz?... -
@SpookDog said in Engine casing discrepancies:
Is it normal for two casings to be different? Specifically the inlet porting? The right side case doesn’t match the left by about 8mm! It’s an old 3bn that I don’t know the history of (eBay). I’m guessing that they two different year casings.
Is it best to match them or is it normal?..
CheersI know it’s an old post, but I’ve only sussed out pics recently. Check out the casing join inside the inlet!...
What say yooz?...