How big can 750-4 go?

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Re: How big can 750-4 go?

02 Sep 2018 13:28
#790160
If you want to build a head turning motor to prove your talents as a fabricator why not just
do something like this ????
Dave

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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Re: How big can 750-4 go?

02 Sep 2018 13:44
#790161
:lol: :lol: :lol: FRIGHTENING :ohmy:
Steve

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Re: How big can 750-4 go?

02 Sep 2018 16:02
#790170
650ed wrote:
SWest wrote: ..................Question is how much do you want to spend when you can always get a bigger bike? :whistle:
Steve

Excellent question! For example, given enough funds one could use (make) a 750 turbo engine and with appropriate mods turn it into a monster such as one in the link below. Ed

www.750turbo.com/forum/viewtopic.php?f=9...f51c1956060ca2366de2

Then boys across the pond making big hp.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63" wheel base.

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Re: How big can 750-4 go?

03 Sep 2018 18:33
#790278
Had some free time today on my day off so started messing with the CAD work on the new piston. It should get me a tiny boost in compression (added .020” to the highest point of the dome) the new sleeves should be here tomorrow! I’m going to hard anodize the piston from the oil ring groove up, and will cerakote the skirts with microslick low drag coating. The first few pics are the ‘blank’ from which I will create the custom castings, the last 2 pics are once I finish the machining work on the piston.

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Re: How big can 750-4 go?

03 Sep 2018 19:20
#790283
Down the road I may go the Allen Millyard direction eventually, or maybe even the Ian Drysdale direction. But I think I’ll cut my teeth on this project, exactly as I’ve described. Keep stock stroke, stock crank, stock rods, and just ridiculous bore haha. Maybe I can get some good RPM out of it if I can blend the head runners well enough to get some decent flow characteristics.

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Re: How big can 750-4 go?

03 Sep 2018 19:44 - 03 Sep 2018 20:40
#790285
As for the ‘not roundness’ of the piston, it’s actually more like conical, tapered, and only by about .015” diametrically at the bottom of the skirt, so I will just cut my casting on the lathe, and give it about 1 degree of taper. Plus the cerakote will add about .0015” to the skirts as well. The rest will be fixed by my changes to the piston shape itself, to get it more modern, eliminate all the excess piston drag. We’ve come to the point with modern pistons that we have learned that there’s no need for a skirt under the wrist pin, aside from sufficient material to allow proper strength when ‘pulling’ in intake mixture.
Last edit: 03 Sep 2018 20:40 by daveyg.

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Re: How big can 750-4 go?

03 Sep 2018 20:49
#790290
If the results of my 932cc super big bore are not sufficient for my fun, I may try supercharging it. I’ve played with turbos a few times, and turbos plus carburetors usually don’t play well, and I don’t like fuel injection enough yet to build my own from scratch a la megasquirt so if I get to that point I will hunt down a small (Aisin or the like) supercharger instead and run that with a huge (for a bike) draw thru carb feeding into it.

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Re: How big can 750-4 go?

04 Sep 2018 17:30
#790341
Well my donor jugs arrived today and unfortunately in my excitement and haste, I broke one of the sleeves pressing them out. Good thing I can get 4 more for about $40 hahahaha. Anyway, here’s the requisite comparison photos. The factory 750 liner actually fits INSIDE the new liner. The new liners are 81mm outside diameter, so they’ll actually be ever so slightly touching once installed at the 750 bore spacing hahaha! This is gonna be great!

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Re: How big can 750-4 go?

04 Sep 2018 17:52
#790342
Oops I forgot the pics!

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Re: How big can 750-4 go?

04 Sep 2018 20:00
#790347
Let’s try upload one more time.

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Re: How big can 750-4 go?

04 Sep 2018 20:02
#790348
For some reason it’s not loading all my pics today.

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Re: How big can 750-4 go?

13 Sep 2018 17:15 - 13 Sep 2018 17:27
#790828
At one time I was considering doing something similar. What I came up with is to use turbo connecting rods and have them bored one mm and use liners from a 440. This would allow you to use 1015 cc or possible an old 1045cc piston kit for the KZ 900 1000.MAybe even a 1075 . This way it will work and not overheat. If you try and go too big it could be a disaster.
Keeping the good times rolling since 1982. Helping people with parts ,technical support and service of the 70's 80's Kawasakis. Building road bike bikes for individuals involved in Vintage Road Racing in the eastern Ontario region.
Last edit: 13 Sep 2018 17:27 by darlington.
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