1500 Bore Size?
Posted: Mon May 04, 2020 12:18 pm
What is the standard bore size for a 1500 please?
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1500 Bore Size?
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Re: 1500 Bore Size?
Posted: Mon May 04, 2020 12:35 pm
Pretty sure it is the same as the 1300 at 2.9000in (+/-0.5thou). Max oversize is 0.020in. Extra capacity of 1500 is due to longer stroke.
Re: 1500 Bore Size?
Posted: Mon May 04, 2020 12:51 pm
73.7mm or as above 2.9"
I'm running my 1500 engine at +60 overbore though...
I'm running my 1500 engine at +60 overbore though...
Re: 1500 Bore Size?
Posted: Mon May 04, 2020 12:55 pm
Thanks both.
Set of new standard pistons ebay bound shortly!
Set of new standard pistons ebay bound shortly!
Re: 1500 Bore Size?
Posted: Tue Mar 30, 2021 7:37 pm
Hi All
I am looking to buy some new pistons and rings for my 1500 rebuild...
I have contacted a supplier who suggest based on my measured bore size that I need +.0020” ones but I am not convinced...
Measured bore size is 73.74 on 3 bores and 73.71 on the other. Workshop manual says 73.65 nominal giving 0.06 to .09mm bigger.
Based on 73.59mm nominal piston (from the workshop manual) if I go oversize by .0020”. (.502mm) this would make the piston too big at 74.09mm...so too big..
I suspect he is thinking I am going to re-bore based on the wear, but apart from that they are in good condition.
Am I hopefully I can get away with standard pistons and an oversize piston ring.. or am I way out on my calculations...
I am looking to buy some new pistons and rings for my 1500 rebuild...
I have contacted a supplier who suggest based on my measured bore size that I need +.0020” ones but I am not convinced...
Measured bore size is 73.74 on 3 bores and 73.71 on the other. Workshop manual says 73.65 nominal giving 0.06 to .09mm bigger.
Based on 73.59mm nominal piston (from the workshop manual) if I go oversize by .0020”. (.502mm) this would make the piston too big at 74.09mm...so too big..
I suspect he is thinking I am going to re-bore based on the wear, but apart from that they are in good condition.
Am I hopefully I can get away with standard pistons and an oversize piston ring.. or am I way out on my calculations...
Re: 1500 Bore Size?
Posted: Thu Apr 01, 2021 12:14 pm
You've given them the measurement of the bore, they think you've given them the piston size hence them saying you need a bigger piston.storeyn wrote: ↑Tue Mar 30, 2021 7:37 pm Hi All
I am looking to buy some new pistons and rings for my 1500 rebuild...
I have contacted a supplier who suggest based on my measured bore size that I need +.0020” ones but I am not convinced...
Measured bore size is 73.74 on 3 bores and 73.71 on the other. Workshop manual says 73.65 nominal giving 0.06 to .09mm bigger.
Based on 73.59mm nominal piston (from the workshop manual) if I go oversize by .0020”. (.502mm) this would make the piston too big at 74.09mm...so too big..
I suspect he is thinking I am going to re-bore based on the wear, but apart from that they are in good condition.
Am I hopefully I can get away with standard pistons and an oversize piston ring.. or am I way out on my calculations...
Re: 1500 Bore Size?
Posted: Thu Apr 01, 2021 3:41 pm
No. You can't use oversize rings on standard pistons.
Based on your measurements your machine shops advice is correct, you need to rebore and then use appropriate oversized pistons.