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122 Posts Member #: 2023 Advanced Member nr Portsmouth ,Hampshire |
5th Jul, 2012 at 04:38:08pm
Hi what are the maximum boost levels that should be run with 21251 metro pistons ? They are being used in a friends turbo nova ,thanks in advance |
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 3673 Posts Member #: 9300 Post Whore Quarry Bonk |
5th Jul, 2012 at 06:24:24pm
All depends on various conditions mate. There is no definitive answer, Although not a lot if any should be used with those pistons truth be told, I don't really think they're up to the job. Edited by Carlzilla on 5th Jul, 2012. On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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 465 Posts Member #: 1972 Senior Member Worcester |
5th Jul, 2012 at 07:06:22pm
21251s are bad enough on NA motors i wouldnt use them in a forced induction engine! |
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122 Posts Member #: 2023 Advanced Member nr Portsmouth ,Hampshire |
6th Jul, 2012 at 05:04:33pm
Thanks for the replies , anyone else have any experiences ? |
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3006 Posts Member #: 2500 Post Whore Buckinghamshire |
6th Jul, 2012 at 09:13:54pm
I got away with 20psi, briefly, but I cant recommend them (or 20psi !) |
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 9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
6th Jul, 2012 at 09:42:18pm
In short the metro Turbo piston 21251
Edited by BENROSS on 6th Jul, 2012.
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122 Posts Member #: 2023 Advanced Member nr Portsmouth ,Hampshire |
7th Jul, 2012 at 07:56:59am
Many thanks . |
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 6753 Posts Member #: 828 Post Whore uranus |
7th Jul, 2012 at 08:04:47am
On 6th Jul, 2012 BENROSS said:
In short the metro Turbo piston 21251 Stay out of detonation and 14 to 16 psi is realistic regular But the slightest Nats of detonation and the lands will shat themselves 21253 pistons 12 p s I. Max metro N/A pistons steve ,21251... i don't think thats the turbo p/n is it .. http://www.minispares.com/product/Classic/...iston.aspx|Back to search i think 22357 is the turbo one .. http://www.minispares.com/product/Classic/...iston.aspx|Back to search Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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 10023 Posts Member #: 1456 Mongo Barnsley, South Flatcapshire |
7th Jul, 2012 at 08:11:18am
21251 is the low comp heposhite piston. Not suitable for turbo IMHO. If something is worth doing, it's worth doing half of. |
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4309 Posts Member #: 1321 Post Whore Wiltshire |
7th Jul, 2012 at 08:30:05am
Why when he has the pick of the a-series range would he go for that piston? Edited by minimole23 on 7th Jul, 2012. On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding |
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3673 Posts Member #: 9300 Post Whore Quarry Bonk |
7th Jul, 2012 at 10:46:57am
Possibly because he owns a nova? On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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105 Posts Member #: 8995 Advanced Member Poole, Dorset |
7th Jul, 2012 at 07:46:08pm
On 7th Jul, 2012 Carlzilla said:
Possibly because he owns a nova? It's my Nova, and it's a race car; http://www.youtube.com/watch?v=knGHIcjVDGI Thanks to Fraser (5portsrock) for posting up the question on my behalf. I didn't choose the pistons that were used in the car, the chap who built it originally used them, and it was 10 years or more ago now. I don't know what led him to these particular ones, other than they were the right bore size for his needs (and they were cheap). The Nova has used these pistons for all this time with no problems, at 1.5bar of boost. But I'd like to increase the boost levels soon, along with some steel rods for more revs. I was hoping to find a direct replacement forged-type piston, and avoid doing any machining work in the block. But from what Fraser has been able to ascertain, there is only an overbored option available at 0.020"; http://www.med-engineering.co.uk/catalogue...istons-020-18cc If anyone knows any different, please let us know! Thanks. ps - the engine has to run at 999cc or below, due to the Class regulations for hillclimbs and sprints. With the 70.61mm piston it works out at 985cc. Edited by novarally on 7th Jul, 2012. |
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4309 Posts Member #: 1321 Post Whore Wiltshire |
7th Jul, 2012 at 07:50:55pm
Scratch what I said, did not realise you were still standard bore.
Edited by minimole23 on 7th Jul, 2012. On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding |
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3673 Posts Member #: 9300 Post Whore Quarry Bonk |
7th Jul, 2012 at 09:17:19pm
Fair enough, at least it's not one of the usual bodykitted up pos that you see on the road.
On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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