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3 Posts Member #: 10943 Junior Member |
24th Mar, 2017 at 09:28:49pm
So after months of toying with the idea of a supercharger I have finally decided to go turbo since the car will be used regularly and will be driven long distance to shows and i really dont fancy 25mpg everywhere.
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
25th Mar, 2017 at 04:11:58am
Reliability is hard to quantify really; but doing certain things like on the undercrown cooling jets definitely will make a difference in the longevity of pistons; especially those at the cheaper end of the market.
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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3 Posts Member #: 10943 Junior Member |
25th Mar, 2017 at 07:36:18am
Hi thank you for the reply.
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 6729 Posts Member #: 618 Post Whore Glasgow |
25th Mar, 2017 at 08:36:29am
there is a thread somewhere for installation of the under crown jets. I think the current jet of choice is the bmw one (or 4 to be precise!) |
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 971 Posts Member #: 3228 Post Whore North of the Netherlands |
25th Mar, 2017 at 09:07:07am
From what I have seen posted earlier the 21521 pistons are not that suitable for boosted applications...
Dazed and Confused.... |
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3588 Posts Member #: 655 Post Whore Northern Ireland |
25th Mar, 2017 at 10:06:47am
Unless you're making a lot of power and for long duration then oil jets really are not needed.
9.85 @ 145mph
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3004 Posts Member #: 2500 Post Whore Buckinghamshire |
25th Mar, 2017 at 08:10:08pm
As said many times before on here the standard Metro turbo piston is pretty good and will stand a lot of abuse. |
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4304 Posts Member #: 1321 Post Whore Wiltshire |
25th Mar, 2017 at 08:45:15pm
I would save the under crown cooling jets unless taking to the track and just use a decent set of omega pistons. Given the cost of preparing a block 100 quid extra for the pistons will have little impact on the overall budget but be a fit and forget option. On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding |
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3588 Posts Member #: 655 Post Whore Northern Ireland |
25th Mar, 2017 at 10:58:51pm
On 25th Mar, 2017 tadge44 said:
As said many times before on here the standard Metro turbo piston is pretty good and will stand a lot of abuse. Yep, they might be big and ugly...but they're very robust ! 9.85 @ 145mph
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3 Posts Member #: 10943 Junior Member |
26th Mar, 2017 at 10:22:49am
Okay guys it looks like better pistons are on the list haha. Thanks for everyones input im sure ill be asking alot more as the build goes on :) |
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 7763 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
26th Mar, 2017 at 11:55:48am
21251 are the worst aftermarket pistons out there. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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 2742 Posts Member #: 637 Post Whore Hertfordshire |
26th Mar, 2017 at 01:47:24pm
I've always thought you get enough oil splashing up from the gearbox to not warrant under crown jets? My build thread..
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3588 Posts Member #: 655 Post Whore Northern Ireland |
29th Mar, 2017 at 10:27:34am
On 26th Mar, 2017 JT said:
I've always thought you get enough oil splashing up from the gearbox to not warrant under crown jets? Again depends on the application. For low powered and light-moderate use builds...then they are in no way needed at all. For something pushing very hard, or that sees track use etc, then they can be useful. Or perhaps setups with fuel/charge cooling limitations where combustion temps might be higher for those reasons. Ultimately they are a piston cooling feature, although the huge chunky mini pistons would absorb a fair bit of heat anyway, and the big skirts should also allow it to dissipate well even without oil jets. 9.85 @ 145mph
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 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
29th Mar, 2017 at 12:01:54pm
bare in mind that the box will only really throw oil up at bores 2,3 & 4, plus the crank is in the way, and the oil can have a few bits in from the box,
On 26th Mar, 2017 JT said:
I've always thought you get enough oil splashing up from the gearbox to not warrant under crown jets? On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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3588 Posts Member #: 655 Post Whore Northern Ireland |
29th Mar, 2017 at 06:24:53pm
On 29th Mar, 2017 Joe C said:
bare in mind that the box will only really throw oil up at bores 2,3 & 4, plus the crank is in the way, and the oil can have a few bits in from the box, On 26th Mar, 2017 JT said: I've always thought you get enough oil splashing up from the gearbox to not warrant under crown jets? But oil will always be splashing from the rod journal for each cylinder. I've seen some rods and people modify some rods wit a little cut on the side face which they claim can allow some oil from the journal to make it's way to the piston underside too. Either way, no big deal. 9.85 @ 145mph
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