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400 Posts Member #: 2563 Senior Member Tamworth |
24th Apr, 2012 at 10:17:20am
Looks like I need to put the price of my unleaded conversions up.
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 2233 Posts Member #: 9037 Post Whore Doncaster, yorkshire |
24th Apr, 2012 at 10:26:37am
Go for it at £200, at least you know you will get it back in a decent time frame. Audi s4 b5 - 470bhp & 486ft lbs
On 15th Mar, 2012 wil_h said:
Yes, Carl says he gets requests for rimming all the time On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble  |
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 (2)[/url] by [url=https://www.flickr.com/photos/150672766@N03/]Rod Sugden[/url], on Fli) 5988 Posts Member #: 2024 Formally Retired Rural Suffolk |
24th Apr, 2012 at 10:58:32am
On 24th Apr, 2012 01smartc said:
Looks like I need to put the price of my unleaded conversions up. We only charge £85! Chris Just out of interest Chris, do you press them in or use liquid nitrogen ??? The price I quoted was for nitrogen, a bit more expensive around here as they only rent the flask for a day and it travels a long way..... Schrödinger's cat - so which one am I ??? |
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114 Posts Member #: 9645 Advanced Member South Wales |
24th Apr, 2012 at 11:45:12am
Rod out of interest are we only talking about exhaust valve inserts? Is there any need to put inserts in the inlets as well?
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5988 Posts Member #: 2024 Formally Retired Rural Suffolk |
24th Apr, 2012 at 11:52:48am
On 24th Apr, 2012 minivan63 said:
Rod out of interest are we only talking about exhaust valve inserts? Is there any need to put inserts in the inlets as well? Did the testing look at both valves or just the exhausts? Cheers. So far as I'm aware the testing (back in the 90s) was only on exhaust seats. Theoretically there is no reason for inserts on inlets on a cast iron head because the temperatures are so much lower. Modern engines have inserts on both because they are usually aluminium heads. Schrödinger's cat - so which one am I ??? |
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
24th Apr, 2012 at 12:23:29pm
I remember that testing report. iirc, the A-series was chosen mainly because it suffered more wear than any other head.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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400 Posts Member #: 2563 Senior Member Tamworth |
24th Apr, 2012 at 12:34:13pm
That is pressed in, have seen the nitrogen used. Seems alot of hassle and expense for the same end result I think.
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
24th Apr, 2012 at 12:46:08pm
Std 295 valves will be junk in no time with unleaded seats/fuel. You need som proper exhaust valves while at it. 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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5988 Posts Member #: 2024 Formally Retired Rural Suffolk |
24th Apr, 2012 at 01:27:11pm
On 24th Apr, 2012 01smartc said:
That is pressed in, have seen the nitrogen used. Seems alot of hassle and expense for the same end result I think. What would you say the benefits over pressing are? Chris Chris, Purely a personal point of view.... Nitrogen allows minimal force on insertion and the insert expands back to it's correct size quite slowly. That "should" minimize the possibility of cracking especially on large valve sizes. Pressing in adds additional stresses (because there is minimal size difference) and "may" pickup on the sides because of the interference fit being so much greater being done cold. BUT that is purely my opinion. On a standard head I doubt there is much difference, but on a head with larger valves (so the pressed in seat is closer to the (basic) inlet seat), I would go for nitrogen every time. Having said all of that, my 1275 head has pressed in seats but it's not quite at the maximum valve sizes. It's a case of read up on it and make your own choice. Schrödinger's cat - so which one am I ??? |
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