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Author Topic: First build ever  (Read 10025 times)

Offline crazypj

  • Posts: 12483
  • Split personality, I fake being smart
Re: First build ever
« Reply #100 on: Jul 21, 2017, 20:56:43 »
I think you would need pipes coming either side of cylinders to make a nice looking underseat exhaust, both coming in from left just doesn't sound right?
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline onefromexile

  • Posts: 233
Re: First build ever
« Reply #101 on: Jul 21, 2017, 22:42:06 »
I think you would need pipes coming either side of cylinders to make a nice looking underseat exhaust, both coming in from left just doesn't sound right?
Yes unless two to one and run it oval
Under seat but that's prolly too extreme for me and this build
I don't think it looks too bad in the photoshop image having longer pipes like that
My seat is a lil longer than the bike in picture so that will help with the look


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Offline crazypj

  • Posts: 12483
  • Split personality, I fake being smart
Re: First build ever
« Reply #102 on: Jul 22, 2017, 20:55:40 »
The intake is sized for a 400 motor stock so you have to be very careful doing any mods. I tend to smooth it out slightly and unrestrict valve guide boss. The exhaust side is the restricted area, you can pretty much carve on it without hurting any flow (although it is possible to go too far it takes a lot of cutting). With a 378cc conversion everything works much better. The AG Bell books give a lot of information that works but David Vizard keeps up with later developments (I guess he 'invented' some of the stuff various racing engines use?)
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline onefromexile

  • Posts: 233
Re: First build ever
« Reply #103 on: Jul 22, 2017, 21:19:34 »
The intake is sized for a 400 motor stock so you have to be very careful doing any mods. I tend to smooth it out slightly and unrestrict valve guide boss. The exhaust side is the restricted area, you can pretty much carve on it without hurting any flow (although it is possible to go too far it takes a lot of cutting). With a 378cc conversion everything works much better. The AG Bell books give a lot of information that works but David Vizard keeps up with later developments (I guess he 'invented' some of the stuff various racing engines use?)


Yeah I was unable to find anything specific in his books for a 360 motor but
Was able to learn a lot and understand the theories and principles behind it

So I went with your advice and his theories and ended up with great looking head lots of work like 45+ hours into it stayed away from intake side just cleaned up some of the poop from casting and was able to use a pretty expensive piece of inspection equipment to port he match as.close I could
It's within a thou
Roundness and diameter
The exhaust worked
Gs850 Pistons had to have em
I'm hoping for solid results improvements


I just had new bronze guides driven
And last is new valves




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Offline onefromexile

  • Posts: 233
Re: First build ever
« Reply #104 on: Jul 22, 2017, 21:20:59 »

Yeah I was unable to find anything specific in his books for a 360 motor but
Was able to learn a lot and understand the theories and principles behind it

So I went with your advice and his theories and ended up with great looking head lots of work like 45+ hours into it stayed away from intake side just cleaned up some of the poop from casting and was able to use a pretty expensive piece of inspection equipment to port he match as.close I could
It's within a thou
Roundness and diameter
The exhaust worked
Gs850 Pistons had to have em
I'm hoping for solid results improvements


I just had new bronze guides driven
And last is new valves




Sent from my iPhone using DO THE TON




Sent from my iPhone using DO THE TON

Offline crazypj

  • Posts: 12483
  • Split personality, I fake being smart
Re: First build ever
« Reply #105 on: Jul 22, 2017, 21:29:52 »
45 hrs sounds a bit much but as you had some specialised equipment to match left and right I guess it's not too bad.
 Long time ago (around 1980) I spent over 25 hrs doing just one intake on a GS550 then around the same to get the other 3 intakes matched (much easier when you have a pattern to follow) Turned out a stupidly fast bike after big bore conversion, frame welding, stock carbs bored oversize and a full race exhaist and cams (around 170 mph but not with me on it  :o ) Honda VFR 750 had just been launched, it was great fun running away and hiding from them on what looked like a POS  ;D 8)
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline onefromexile

  • Posts: 233
Re: First build ever
« Reply #106 on: Jul 23, 2017, 00:37:59 »
45 hrs sounds a bit much but as you had some specialised equipment to match left and right I guess it's not too bad.
 Long time ago (around 1980) I spent over 25 hrs doing just one intake on a GS550 then around the same to get the other 3 intakes matched (much easier when you have a pattern to follow) Turned out a stupidly fast bike after big bore conversion, frame welding, stock carbs bored oversize and a full race exhaist and cams (around 170 mph but not with me on it  :o ) Honda VFR 750 had just been launched, it was great fun running away and hiding from them on what looked like a POS  ;D 8)
I spent way to much time on it but he is my first full build on a motorcycle
Even when I acquire and build more down the line he will be my prize my daily rider
I used a cmm inspection machine
I checked every surface ,angle , dimension , I've been so precise remember our ring gap and cylinder bore discussion??
I shopped around finally found a shop that can guarantee my specs wanted
I even had my gs Pistons polished perfect both same size but one is a lil less than a gram heavier
Overkill
I do want my 360 to be bad ass
I don't want to go extreme like cams I only have aluminum seats lol you know
I do plan on an upper oil mod
But I have an extra rocker box cover and such for that
I'd love to discuss more on
I've found micro pump that would be perfect for it
Vfr750 I just picked up a 94 it was free just had to pay gas to pick it up
I had a discussion going about using any of it on a cb750 roller I also got for free




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Offline crazypj

  • Posts: 12483
  • Split personality, I fake being smart
Re: First build ever
« Reply #107 on: Jul 23, 2017, 13:38:15 »
I've given a dedicated 'top end' oil pump a lot of thought over the years but decided against it every time. Modification plus better voil seems to have cured the 'problem'. I've stripped a few motors now that look better than when they were assembled.I am doing the external oil line bypassing filter on a couple of engines though.
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline onefromexile

  • Posts: 233
Re: First build ever
« Reply #108 on: Jul 23, 2017, 20:02:39 »
I've given a dedicated 'top end' oil pump a lot of thought over the years but decided against it every time. Modification plus better voil seems to have cured the 'problem'. I've stripped a few motors now that look better than when they were assembled.I am doing the external oil line bypassing filter on a couple of engines though.

I plan on running no external yet but still work on developing a system
Mostly for cooling the oil

Look at what I just dragged home


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Offline onefromexile

  • Posts: 233
Re: First build ever
« Reply #109 on: Jul 23, 2017, 20:20:13 »
Look at what I just dragged home


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84' gs400



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