1500 Bore Size?

For everything to do with Dolomites, Toledos, FWD cars and Dolomite-based kitcars.
Post Reply
Message
Author
User avatar
xvivalve
TDC West Mids Area Organiser
Posts: 13580
Joined: Thu Sep 28, 2006 1:13 pm
Location: Over here...can't you see me?

1500 Bore Size?

#1 Post by xvivalve »

What is the standard bore size for a 1500 please?
Top
User avatar
gmsclassics
TDC Member
Posts: 669
Joined: Fri Oct 06, 2006 9:57 am
Location: Auckland, New Zealand

Re: 1500 Bore Size?

#2 Post by gmsclassics »

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.
Top
User avatar
yorkshire_spam
Guest contributor
Guest contributor
Posts: 994
Joined: Wed Nov 15, 2017 3:35 pm
Location: Filey, North Yorkshire

Re: 1500 Bore Size?

#3 Post by yorkshire_spam »

73.7mm or as above 2.9"
I'm running my 1500 engine at +60 overbore though... :-)
Image
Top
User avatar
xvivalve
TDC West Mids Area Organiser
Posts: 13580
Joined: Thu Sep 28, 2006 1:13 pm
Location: Over here...can't you see me?

Re: 1500 Bore Size?

#4 Post by xvivalve »

Thanks both.

Set of new standard pistons ebay bound shortly!
Top
storeyn
TDC Spares Officer
Posts: 187
Joined: Sat Feb 18, 2012 11:43 am
Location: Shaftesbury

Re: 1500 Bore Size?

#5 Post by storeyn »

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...
Triumph Dolomite Club Spares Officer
Track day Sprint for track fun....
Looking for something interesting for summer time daily use...
Skoda Superb 4x4 for everyday use...
Top
User avatar
TrustNo1
Guest contributor
Guest contributor
Posts: 1635
Joined: Mon Jun 03, 2013 5:48 pm

Re: 1500 Bore Size?

#6 Post by TrustNo1 »

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...
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.
Some people are like Slinky's, they serve no real purpose in life but bring a smile to your face when you push them down the stairs.
Top
matt of the vivas
Guest contributor
Guest contributor
Posts: 868
Joined: Thu May 17, 2012 9:34 pm

Re: 1500 Bore Size?

#7 Post by matt of the vivas »

storeyn wrote: ↑Tue Mar 30, 2021 7:37 pm 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.
Top
Post Reply

Return to “Dolomite-related [Start here!]”