73.7mm or as above 2.9"
I'm running my 1500 engine at +60 overbore though...
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| Author: | xvivalve [ Mon May 04, 2020 12:18 pm ] |
| Post subject: | 1500 Bore Size? |
What is the standard bore size for a 1500 please? |
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| Author: | gmsclassics [ Mon May 04, 2020 12:35 pm ] |
| Post subject: | Re: 1500 Bore Size? |
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. |
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| Author: | yorkshire_spam [ Mon May 04, 2020 12:51 pm ] |
| Post subject: | Re: 1500 Bore Size? |
73.7mm or as above 2.9" I'm running my 1500 engine at +60 overbore though...
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| Author: | xvivalve [ Mon May 04, 2020 12:55 pm ] |
| Post subject: | Re: 1500 Bore Size? |
Thanks both. Set of new standard pistons ebay bound shortly! |
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| Author: | storeyn [ Tue Mar 30, 2021 7:37 pm ] |
| Post subject: | Re: 1500 Bore Size? |
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... |
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| Author: | TrustNo1 [ Thu Apr 01, 2021 12:14 pm ] |
| Post subject: | Re: 1500 Bore Size? |
Quote:
Hi All
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.
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... |
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| Author: | matt of the vivas [ Thu Apr 01, 2021 3:41 pm ] |
| Post subject: | Re: 1500 Bore Size? |
Quote:
Am I hopefully I can get away with standard pistons and an oversize piston ring.. or am I way out on my calculations...
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. |
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