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Post by spondon440 on May 13, 2023 19:06:24 GMT 1
I've got some Wisco 615 big bore pistons for the GPZ550 project, couple of questions if someone can help, I asked on the GPZ550 forum and got fukall so am trying here.
Firstly do I need to use Torque plates when I have the cylinders bored out? and does anyone know who could do the work, I'm guessing boring 3mm out of a 4 cylinder block isn't normal fair.
Thanks in advance
Andy
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Post by donkeychomp on May 13, 2023 21:17:47 GMT 1
Oh thank goodness. I thought it might be a 'where do babies come from question'.
As for the bike, hopefully someone here will know. This place is like a motorcycle encyclopedia.
Alex
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Post by spondon440 on May 13, 2023 23:50:45 GMT 1
Your right, they must all be watching eurovision tonight though.
Andy
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Post by donkeychomp on May 14, 2023 0:02:11 GMT 1
Euro what?
Alex
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Post by midlifecrisisrd on May 14, 2023 10:44:29 GMT 1
I had to Google it as had never heard of it
I'd say if PJME or Grampian don't do it then I wouldn't bother
From what I read it was only talked about on forums trying to squeeze every hp out of a race engine with tight tolerances
If you were going to go to the bother of making a plate would you then heat the block to operating temperature as well
Steve
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Post by muttsnuts on May 14, 2023 11:43:57 GMT 1
Hi Andy, tkaing 3mm out with a boring bar is a lot of work, maximum cut is recommended never to be more than 0.5mm otherwise it can shag the cutters etc
It can be done, but that's a lot of work, especially when you times it by 4, that's 24 cutting operations and restting of the cutter each time, then of course final hone
Not familiar with that block but surely that will leave the liners very thin and subject to distortion and cooling issues?
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Post by veg on May 14, 2023 14:11:52 GMT 1
Tony huck at maitland racing and towcester tuning services are still trading I know they used to do big bore kits, could they help Andy? I could email my mate dom who now owns Tvr power/doms power. He used to be the head man at what was Nck racing he used to only build kwack motors and they were the main agent for wiseco in the Uk if that’ll help?
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Post by spondon440 on May 14, 2023 20:48:50 GMT 1
I had to Google it as had never heard of it I'd say if PJME or Grampian don't do it then I wouldn't bother From what I read it was only talked about on forums trying to squeeze every hp out of a race engine with tight tolerances If you were going to go to the bother of making a plate would you then heat the block to operating temperature as well Steve Thanks Steve, you have to use torque plates on Harleys and Buells, I've made a few of them for both, you are simulating it being torqued as if fitted to the bike, Sportster cylinders definitely distort when torqued down and are scrap if you bore them without, I'm just trying not to do that with these and hoped someone had experience of doing some. I'll ask Grampian in the morning. Andy |
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Post by spondon440 on May 14, 2023 21:02:07 GMT 1
Hi Andy, tkaing 3mm out with a boring bar is a lot of work, maximum cut is recommended never to be more than 0.5mm otherwise it can shag the cutters etc It can be done, but that's a lot of work, especially when you times it by 4, that's 24 cutting operations and restting of the cutter each time, then of course final hone Not familiar with that block but surely that will leave the liners very thin and subject to distortion and cooling issues? Thanks Dave, I'm debating roughing them out myself in the garage, they end up with a 1.5mm wall thickness on the liners, weirdly, the first engine I bought which turned out to be fairly fuced as it was full of water, I fully stripped it for anything useful and low and behold the cylinders were big bore. Its not a rare mod, a mate back in the daydid it to a GS550 out to 615cc, he did 30k on it without issues so I'm hopefull it'll be fine. Andy |
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Post by spondon440 on May 14, 2023 21:18:04 GMT 1
Tony huck at maitland racing and towcester tuning services are still trading I know they used to do big bore kits, could they help Andy? I could email my mate dom who now owns Tvr power/doms power. He used to be the head man at what was Nck racing he used to only build kwack motors and they were the main agent for wiseco in the Uk if that’ll help? Hi Tim, Yes would appreciate that, especially any other pearls of wisdom on extracting anymore power out of these engines that would be even better. Andy |
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Post by veg on May 14, 2023 21:40:08 GMT 1
I’ve got to email him tomorrow so I’ll ask him if he can recall anything or who he would use? He has just done a z1000 custom. Back in the day he had a mega reputation and built all the nash drag race motors with my brother.
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Post by chippy348 on May 14, 2023 21:52:45 GMT 1
I have done a few over the years, no need for Torque plates. The clearance Wiseco spec is usually on the loose side and can smoke, i tend to set them tighter.
The other note is they always pull in on the skirt when going that thin, so careful honing is required.
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Post by spondon440 on May 14, 2023 21:59:27 GMT 1
I’ve got to email him tomorrow so I’ll ask him if he can recall anything or who he would use? He has just done a z1000 custom. Back in the day he had a mega reputation and built all the nash drag race motors with my brother. Thanks pal, appreciated. By the way, who was it that had the M1? Regards Andy |
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Post by spondon440 on May 14, 2023 22:06:56 GMT 1
I have done a few over the years, no need for Torque plates. The clearance Wiseco spec is usually on the loose side and can smoke, i tend to set them tighter. The other note is they always pull in on the skirt when going that thin, so careful honing is required. Thanks Pal, still trying to find someone to do the work, pjme seem to make all the right noises and I've sent them an email. Andy |
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Post by veg on May 14, 2023 22:20:57 GMT 1
I’ve got to email him tomorrow so I’ll ask him if he can recall anything or who he would use? He has just done a z1000 custom. Back in the day he had a mega reputation and built all the nash drag race motors with my brother. Thanks pal, appreciated. By the way, who was it that had the M1? Regards Andy An old boy up Lancashire way knocking on for 80 and always wanted one. 😁 |
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Post by chippy348 on May 14, 2023 22:40:03 GMT 1
I have done a few over the years, no need for Torque plates. The clearance Wiseco spec is usually on the loose side and can smoke, i tend to set them tighter. The other note is they always pull in on the skirt when going that thin, so careful honing is required. Thanks Pal, still trying to find someone to do the work, pjme seem to make all the right noises and I've sent them an email. Andy I will try and reply to your Email tomorrow  |
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Post by Tobyjugs on May 15, 2023 8:02:26 GMT 1
I have done a few over the years, no need for Torque plates. The clearance Wiseco spec is usually on the loose side and can smoke, i tend to set them tighter. The other note is they always pull in on the skirt when going that thin, so careful honing is required. This is good to know, about 15 years ago the then account manager in my company offered me his Z650 if i didnt want it he would throw it in the skip. It turned out to have a big bore kit from Jan Smit Power Parts. It uses a little oil. Its one of those projects that is on the top of my fantasy list to restore but maintenace on those damn twostrokes keep getting in the way.  |
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Post by 4l04ever on May 15, 2023 11:04:59 GMT 1
My engine man in Rugeley could do this. If you need his details, drop me a PM. They have been doing engine work for about 40 years now, and do liner repairs etc, so used to boring stuff out bigger.
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