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 Pinto Pistons
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joethescoot
Starting Member

United Kingdom
27 Posts

Posted - 22 Nov 2020 :  17:46:09 Show Profile Reply with Quote
Please can you help me.
If I fit 91 mm pinto HC pistons and a 1700 crank ,am I right in thinking I use 1500 con rods , and I dont need to adjust the piston height or the block height.
Roughly what cc will I run.
In
Many thanks Joe

I really enjoy this forum.

melle
V4 Guru

United Kingdom
3203 Posts

Posted - 22 Nov 2020 :  22:51:57 Show Profile Reply with Quote
Hi Joe, been a while! All con rods are the same length (130.5mm from memory), V6 ones too. A 1.7 crank with 91mm HC pistons will result in 1740cc. I've never used Pinto pistons, but I know Beta had to have his pistons machined because they protruded above the deck.

www.saabv4.com
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joethescoot
Starting Member

United Kingdom
27 Posts

Posted - 23 Nov 2020 :  07:07:15 Show Profile Reply with Quote
Mille.
What piston would you use ? And if Im going to have to have a Rebore would you go bigger. Many thanks Joe
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melle
V4 Guru

United Kingdom
3203 Posts

Posted - 23 Nov 2020 :  08:48:31 Show Profile Reply with Quote
I've only ever used 2nd hand 1700 pistons. The need for bigger diameter pistons depends on what you want from the engine.

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joethescoot
Starting Member

United Kingdom
27 Posts

Posted - 23 Nov 2020 :  18:21:40 Show Profile Reply with Quote
If I use 1700 pistons theres no need for any machining.
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melle
V4 Guru

United Kingdom
3203 Posts

Posted - 23 Nov 2020 :  18:32:37 Show Profile Reply with Quote
There shouldn't be as long as the pistons and cylinder walls are in good condition (assuming you're using std diameter pistons in std diameter bores).

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Edited by - melle on 23 Nov 2020 18:33:21
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joethescoot
Starting Member

United Kingdom
27 Posts

Posted - 23 Nov 2020 :  21:01:46 Show Profile Reply with Quote
Merle what is standard size
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melle
V4 Guru

United Kingdom
3203 Posts

Posted - 23 Nov 2020 :  21:36:42 Show Profile Reply with Quote
90mm. Download the factory workshop manual from my website if you don't have it, all engine specs are in section 0: http://www.saabv4.com/index.php/saab-factory-manuals/saab-v4-factory-workshop-manual-english/

www.saabv4.com
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TTruckie
V4 Fanatic

United Kingdom
313 Posts

Posted - 21 Dec 2020 :  21:53:57 Show Profile Reply with Quote
Yes you can use pinto pistons with a 1700 crank and standard 1500 conrods. The pinto pistons, like the 1700 pistons, have a shorter side skirt than the 1500 pistons, which is why you can't use 1500 pistons with a 1700 crank as the corned will hit the skirt. Pinto pistons are easy to get and therefore quite cheap and come ia a selection of sizes and tend to be high compression. A lot of the 1700 pistons you can get are the low compression type. Burtons can give advise.

I did not need to skim the pinto pistons when I built my 1740 engine

Edited by - TTruckie on 21 Dec 2020 21:55:28
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