Piston Types
hello my Scooby pals
ive been trying to find out what piston type belong to what engine i have type A in my v3 STI engine but in another engine i have:- 1 x type A MR2 1 x type A L72 1 x type B L72 1 x type B ME2 any wisdom would be appreciated :notworthy |
Wouldnt worry too much about the MR2/L72 codes as they are batch codes.
Compression Height,shape of the crown/Crown ID marks and cast or forged would identify what engine they came out of. Failing that, post some pics up :D Mick |
they are in the engine. i dont want to sell the short block if the pistons arent right thats all
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i just managed to find out:-
The "B" piston has an outer diameter of 3.6211 to 3.6214 inches The "A" piston has an outer diameter of 3.6214 to 3.6218 This way you can select an "A" or "B" piston to get the correct piston to sidewall clearance. Measure the bore, do the math, and select the correct piston for that bore lol 3 tenths of an inch, that is mad! |
Originally Posted by jamielove69
(Post 10059444)
i just managed to find out:-
The "B" piston has an outer diameter of 3.6211 to 3.6214 inches The "A" piston has an outer diameter of 3.6214 to 3.6218 This way you can select an "A" or "B" piston to get the correct piston to sidewall clearance. Measure the bore, do the math, and select the correct piston for that bore lol 3 tenths of an inch, that is mad! |
Isn't it 3 ten thousanths of an inch?
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no its 3 thousandths of an inch. after the decimal point it runs
1/10 1/100 1/1000 the difference between 3.6211 and 3.6214 is 3 thousandths |
Surely
.6 = tenths .62 = hundredths .621 = thousandths .6211 = ten thousandths .6214 = ten thousandths so .6214 - .6211 = .0003 i.e. 3 ten thousandths is that not right? |
im an engineer so here goes - 0.1 is 100 thou. 0.02 is 20 thou. 0.003 is 3 thou. 0.0004 is 4 tenths. I was right. ;)
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Me too. I think he misunderstood your earlier post as 1/10 instead of your abbreviation for 1/10,000.
I agree with you, how mad is that? The piston rings should handle that difference quite easily. |
oh i see. Ye that is mad. Sod honing someones bores. Lol just realise what ive just said :O
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on looking at it again, you're right. it's 3/10000. so used to working in 1/1000s. i think 3/10000 is pretty close not to worry.
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Originally Posted by bigsinky
(Post 10059951)
no its 3 thousandths of an inch. after the decimal point it runs
1/10 1/100 1/1000 the difference between 3.6211 and 3.6214 is 3 thousandths |
that would be 3/10000s you smart arse cnut. i apologised, it was a mathematical genius' moment of weakness. what mechanics work to ten thou of an inch anyway?
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toooo many 0s to be meaningful. (Unless it was £££!).
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Originally Posted by bigsinky
(Post 10060458)
that would be 3/10000s you smart arse cnut. i apologised, it was a mathematical genius' moment of weakness. what mechanics work to ten thou of an inch anyway?
Now now |
;)
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