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 161 Posts Member #: 6857 Advanced Member Lieto / Finland |
11th Apr, 2010 at 08:35:31pm
Really shit happened to you Richard!
Edited by nuukuus on 11th Apr, 2010. 1399cc, Eaton M45 supercharger, N2O system, compression ratio 9.23:1, boost pressure 0,8bar/11.6psi.
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 11046 Posts Member #: 965 Post Whore Preston On The Brook |
11th Apr, 2010 at 08:40:20pm
On 11th Apr, 2010 turbominivanman said:
Sprox. Great shot mate, makes mine look like a walk in the park to fix. I guess it's a fair question but with the valve cutouts for the 16v bimmer conversion, the work on the piston crown leaves a shit load of sharp thin edges in the flame front. In their own right, aren't these a source of detonation ? Is there scope to smooth these out without affecting CR or ring land ? Richard. The failure mode on my piston could be considered similar to yours. The failure of my piston was due to a similarly lean condition at full throttle but using Nitrous. Dont be surprised to find your piston in a similar way when you get it out. One thing I can tell you is that a new piston, a quick hone and it should be good as new. I doubt the valve cut had anything to do with it. The valve cuts in my pistons replicate those of the original BMW pistons, unlike 99% of all other BMW K head conversions. Add to that there are billions of other pistons with similar valve cuts in manufacturers engines running without any issue, a sharp edge is unlikely to cause detonation, but a thin edge, may? On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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 1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
11th Apr, 2010 at 08:40:20pm
On 11th Apr, 2010 robert said:
bore clearance is normally at the skirt at right angles to the pin ,rich ,around 2 to 4 thou , depending on piston material and usage . Ok cheers Robert, will have to wait for a while to find out what mine is now. I know I'm fishing but what's a typical clearance at the top then ? Surely you shouldn't be able to see the top ring ? I can on all other pots. I reckon I measured beween 0.020-0.022 with feelers on the other three cylinders when I had the head off last night. Something's amiss, that sounds enormous if the skirt is 0.002-0.004 in. Thanks again. Richard. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
11th Apr, 2010 at 08:56:14pm
On 11th Apr, 2010 nuukuus said:
Really shit happened to you Richard! But try to take solace that it already happen to other people also and will happen later also. (I hope that I wrote, understandably) Jani Yes Jani. Big shit indeed. And no doubt more people will do the same for years to come ! It was going to happen at some time - I learnt that from TM's Jon Flannigan who basically said 'expect to blow more heasd gaskets if you want to run serious boost' - this failure was all my own fault for not reacting quick enough to a lean off when I backed off the throttle at full boost and then thought I could get away with re-applying it to sort the mixture out. Just goes to show how bloody fast detonation can wreck a piston. I think the time was about 20 seconds on the 17 psi log sheet. Wish list for the future : New +.020 Cast Omega 1293 piston and rings MS2 Siamese Code conversion for my MS1 ECU GT17 Turbo to replace the T3 Wet manifold SPi to replace the HIF44 Bigger intercooler to replace the S2 RST I currently have. Oh, and deeper pockets ! Thanks Jani - hope all is well with you and your SC Cabriolet. Richard. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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 9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
11th Apr, 2010 at 08:57:04pm
On 11th Apr, 2010 turbominivanman said:
I reckon I measured beween 0.020-0.022 with feelers on the other three cylinders when I had the head off last night. Something's amiss, that sounds enormous if the skirt is 0.002-0.004 in. Thanks again. Richard. it is quite a big difference from top to bottom clearance im not at home so cant measure my pistons i can imagine it being 0.25 to 0.5mm or so whatever that is in inch Yes i moved to the darkside |
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1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
11th Apr, 2010 at 09:08:17pm
On 11th Apr, 2010 Sprocket said:
.... One thing I can tell you is that a new piston, a quick hone and it should be good as new. That's reassuring mate, thanks. Richard. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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1267 Posts Member #: 831 Post Whore Montreal, Canada |
11th Apr, 2010 at 09:11:42pm
Actually, if you go with a wet manifold you don't need to use MS2 or the Siamese code. You could use MS1 and use 2 or 4 injectors at, or near, the throttle body and 4 squirts alternating. And it's going to be the same with MS2.
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 6752 Posts Member #: 828 Post Whore uranus |
11th Apr, 2010 at 10:07:05pm
pistons do taper a fair bit rich ,also ,yes ,any sharp edges are very bad ,it should all be rounded off as much as is feasable ,this is standard performance engine tech 101 lol Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
11th Apr, 2010 at 10:12:18pm
how rounded off is rounded off?
Edited by Sprocket on 11th Apr, 2010. On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
11th Apr, 2010 at 10:19:28pm
On 11th Apr, 2010 jbelanger said:
Actually, if you go with a wet manifold you don't need to use MS2 or the Siamese code. You could use MS1 and use 2 or 4 injectors at, or near, the throttle body and 4 squirts alternating. And it's going to be the same with MS2. To get the benefit from the Siamese code, you need to go to port injection. Jean Thanks Jean. Looks like I have some more background TM thread reading to do ! I agree though, if the benefits are there, I might as well consider making us of them and that means port injection with Siamese Code. Richard. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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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 |
11th Apr, 2010 at 11:42:15pm
On 11th Apr, 2010 turbominivanman said:
On 11th Apr, 2010 jbelanger said:
Actually, if you go with a wet manifold you don't need to use MS2 or the Siamese code. You could use MS1 and use 2 or 4 injectors at, or near, the throttle body and 4 squirts alternating. And it's going to be the same with MS2. To get the benefit from the Siamese code, you need to go to port injection. Jean Thanks Jean. Looks like I have some more background TM thread reading to do ! I agree though, if the benefits are there, I might as well consider making us of them and that means port injection with Siamese Code. Richard. My fault for not being clear enough in my post earlier. Whilst you have MS1 you can do the SPI/wet manifold with your existing MegaSquirt, just change the SU for a throttle body/injector. To use the siamese code requires an MS2 (probably just a plugin daughterboard to upgrade if your main PCB is new enough) but the siamese code only gives you all its benefits with port injection, like the MPI setup or homemade...... and from some of your other photos you're obviously very good with homemade especially when it comes to aluminium. EDIT - you would also need to "upgrade" to dual widebands to monitor the inner/outer exhausts seperately to use the siamese code. Edited by Rod S on 11th Apr, 2010. Schrödinger's cat - so which one am I ??? |
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 209 Posts Member #: 6451 Senior Member South East Northumberland |
18th Apr, 2010 at 07:24:26pm
Bloody hell Richard - I wasn't expecting to come back to read this! Bad luck fella!
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1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
19th Apr, 2010 at 12:45:02am
On 18th Apr, 2010 Cooper1999 said:
Bloody hell Richard - I wasn't expecting to come back to read this! Bad luck fella! If I can help out at all, let me know - my labour's free, and I might learn something! And you've always got a seat for the shows  Cheers Graham. Hastily undertaking DIY completion to then spend some strip down time on the motor. Hoping to have the engine sorted and back in by end of May if I'm being realistic. No mad rush though - will do it properly, including buretting the chambers and pistons (ta for the offer of labour and syringes - gratefully accepted - will be in touch). Got another shit happens story as well. Just been skiing and boarding in Aviemore this weekend - really great time. However, my girlie ski buddy has just side swiped my Coupe into a concrete bollard putting in a left turn out of a housing estate !! This was after I had driven 515 miles to get there and loaned her the car to drive the 7 miles to pick her mate up ! Firkin great gash down the passenger door, rear quarter, rear bumper and alloy wheel. Bloody marvellous ! Just waiting for the third 'shit happens' event to occur now and then I'll have the set. Richard. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
19th Apr, 2010 at 09:45:17am
:( Yes i moved to the darkside |
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 720 Posts Member #: 2588 Post Whore Pretoria South Africa |
19th Apr, 2010 at 10:15:34am
Crap ! I really hope in this instance that the saying, "Things happen in 3s." is not true. Chin mate. "So wat we gonna do tonight Brain?"
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 5329 Posts Member #: 140 Proven 200+bhp & Avon Park 05,06,07 Class D 3rd place |
19th Apr, 2010 at 01:05:05pm
sorry to see this Richard :( Yes i would stick with the cast omegas. Best 1/4 mile 13.2 seconds @116 mph
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3006 Posts Member #: 2500 Post Whore Buckinghamshire |
19th Apr, 2010 at 08:11:27pm
It must be difficult not to feel hard done by, Richard !
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1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
19th Apr, 2010 at 11:41:11pm
On 19th Apr, 2010 tadge44 said:
Pleased to see that your enthusiasm has recovered to the extent that the proposed rebuild has moved from next winter to the end of May, too......... Yes Dave. It's very tempting with Sandie away this week to crack on with the strip but I'd score major BP's if there's evidence of completed DIY in Mothers cottage instead and I'm banking on the spring BH to be in the garage as a result ! The things we do for love ................. 
Richard. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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 16540 Posts Member #: 4241 King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner Rotherham, South Yorkshire |
20th Apr, 2010 at 07:57:26am
So Richard.... Turbo Metro Van versus Turbo Mini Van at Avon this year?
On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it 
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3006 Posts Member #: 2500 Post Whore Buckinghamshire |
20th Apr, 2010 at 08:03:31am
If the DIY is the same standard as your van no one will have any cause for complaint or criticism -even if its "not quite finished yet" |
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1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
20th Apr, 2010 at 01:01:56pm
On 20th Apr, 2010 apbellamy said:
So Richard.... Turbo Metro Van versus Turbo Mini Van at Avon this year? Again similar power to weight. And a similar lack of working engine currently. LMAO !! Yeah - that would be a laugh, as long as the motor's are run-in why not ? How long have we got 'til Avon Andy - is it in July ? Richard. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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16540 Posts Member #: 4241 King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner Rotherham, South Yorkshire |
20th Apr, 2010 at 01:42:28pm
July 10th/11th. Our van has a date on the 31st may so it needs to be driveable by then.
On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it
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 453 Posts Member #: 6449 Senior Member Brisbane, Australia |
20th Apr, 2010 at 03:04:19pm
If not you could do a push race In boost we trust |
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1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
5th Sep, 2010 at 10:30:52pm
Hi guys.
Edited by turbominivanman on 5th Sep, 2010. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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6752 Posts Member #: 828 Post Whore uranus |
6th Sep, 2010 at 06:56:38am
8+26+3.8=37.8cc
Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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