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Cylinder/piston letters.
Posted: Sat Oct 25, 2014 3:29 pm
by GreenyUK
Afternoon folks.
Can some explains the difference between the AAAA and BBBB blocks. I know when replacing pistons you need to match these up. I guess it's because one set is bigger or smaller than other, is this the case? Does anybody know which is which?
If a block takes the smaller type for instance, could I just get the cylinders honed? Which would allow the bigger ones to fit?
Thank you in advance
Posted: Sat Oct 25, 2014 4:23 pm
by Drax
http://www.ludegeneration.co.uk/post235 ... AA#p235700
mentioned here
vtecmec says "It's to do with the variance in cylinder sizes. The B's are slightly larger and have slightly larger 'B' type pistons."
Posted: Sat Oct 25, 2014 5:17 pm
by Vtecmec
Yes, but I then corrected myself
, the B's are the slightly smaller ones.
Posted: Sat Oct 25, 2014 6:08 pm
by 4thgenphil
Vtecmec wrote:Yes, but I then corrected myself
, the B's are the slightly smaller ones.
Really?
Posted: Sat Oct 25, 2014 6:37 pm
by GreenyUK
Thought so, and if the Bs are smaller than that's good lol
As spare engine is ABBB, and i have found some pistons but they are all As
If the Bs are smaller I can just get my block honed out for the As then??
Do you know how much 0.2mm or something like tha?
Cheers.
Posted: Sat Oct 25, 2014 6:40 pm
by 4thgenphil
Of the top of my head its .02mm .
Sorry i haven't replied, currently in a state of perpetual drunkeness.
Posted: Sat Oct 25, 2014 6:42 pm
by GreenyUK
Thought so, and if the Bs are smaller than that's good lol
As spare engine is ABBB, and i have found some pistons but they are all As
If the Bs are smaller I can just get my block honed out for the As then??
Do you know how much 0.2mm or something like tha?
Cheers.
Edit* 0.01mm I see, blimey that is not a lot to remove lol
Edit** oh lol I just got te above from that linked thread.. Lol
Lol fair play that's quite a bender lol
Posted: Sat Oct 25, 2014 7:38 pm
by Vtecmec
4thgenphil wrote:Really?
Yes, I really did correct myself.
It is weird that the B's are smaller though.
From the manual:
Bore diameters:
A's - 87.010-87.020
B's - 87.000-87.010
Pistons:
A's - 86.990-87.003
B's - 86.980-86.993
Posted: Sat Oct 25, 2014 7:56 pm
by GreenyUK
Vtecmec wrote:4thgenphil wrote:Really?
From the manual:
Bore diameters:
A's - 87.010-87.020
B's - 87.000-87.010
Pistons:
A's - 86.990-87.003
B's - 86.980-86.993
Thank you very much for this vtecmec
Do I need to get anything balanced ? I'm just installing standard PDE parts into a spare H22a I dont understand when the need for balancing crank etc is required. Am I right in think it's already done, as I'm just using standard crank in h22 so everything should plug and play so to speak after the hone.
Posted: Sat Oct 25, 2014 8:29 pm
by 4thgenphil
Vtecmec wrote:4thgenphil wrote:Really?
Yes, I really did correct myself.
It is weird that the B's are smaller though.
From the manual:
Bore diameters:
A's - 87.010-87.020
B's - 87.000-87.010
Pistons:
A's - 86.990-87.003
B's - 86.980-86.993
I owe you a hand job