ZX10 pistons/ 750 motor

[Rene EFE]

I remember reading a few things in the past, but searching doesn't really answer my questions;

-Which year ZX10 pistons can you fit to which 750 motor?
-What displacement does this give me?
-What are the other mods involved?
-Who has actually done it?

A quest for more power is on 

Answers below  

[gsxr884]

I have spoken about this before but haven't got around to mocking up an engine yet.

2011 on I think ZX10R pistons are lightweight slipper 76mm so would give 884 on a 749  

Gudgeon pins I think are 15mm possibly 16 I will have  a measure.

I have a set of 884 pistons to measure the ZX10R pistons against for pin to crown height and compare weight , I think the crown will be lower and they will be a LOT lighter 

Edited July 26, 2018 by gsxr884

[Rene EFE]

Lighter is better, but a lower crown could prove to be an issue I guess

[gsxr884]

3 minutes ago, Rene EFE said:

Lighter is better, but a lower crown could prove to be an issue I guess

Yes there may be some compensation required regarding block height

 cam chain length/tensioner blades will be a problem if you shorten the block  longer rods may be required ,once I have measured the pistons I will let you know 

[Rene EFE]

Very keen to find out. I thought there was one guy on here that already had a runner, but I can't find it.

I can't get on with building the Slabby racebike due to having to wait for the frame to become available. Because of that, I want to get a bit clever with the Banana to get some more power out if it

[gsxr884]

Easiest route is a gas flow 3 angle cut and a 771 kit and then some proper carbs matched to a decent exhaust 

[Rene EFE]

Don't want to just fit an 1100 motor, because that's too easy

[Cheeky4648]

@Rene EFE08-12 zx10r pistons are 17mm pin 76mm diameter giving 883. They are a flat top piston so head would have to be skimmed for a raise in cr. Deck height idk but you would have to Bush the little end, drop liners out and skim block at bottom to get height right then refit liners. Done some messing around with gsxr1000 pistons and deck heights aren’t that dissimilar modern to old school piston wise so would guess zx10r aren’t that far from the say what now!? ones. Hope this is of use. 

[Rene EFE]

Are we using the 748 or the 749?

[Cheeky4648]

749. If you have 748 short stroke the rod is 19mm pin so still can Bush it. Strangely deck height on both 748/749 is the same. Also wiseco do an 80 mm piston with a 19mm pin that would probably fit the short stroke with just a liner and bore job. 

[clivegto]

@Danm54 fitted zx10 pistons to his turbo bike I think.

I have a plan to fit a lightened 1052 crank into a 748 motor then fit the 1052 barrels and dot head.

[richyrich]

ive got what i think are 2004 zx10 pistons .  I  really cant remember what the pin size is, but when i got them it all worked out as a straight swap on the 1990 gsxr 7 and b6 , i stand to be corrrected tho as it was a while ago

[manden]

6 hours ago, clivegto said:

@Danm54 fitted zx10 pistons to his turbo bike I think.

I have a plan to fit a lightened 1052 crank into a 748 motor then fit the 1052 barrels and dot head.

if you can make the case accept the long stroke engine youre gonna get a killer motor. got a similar just an 1100 casing with 78mm modern pistons and its a little faster than a bmw s1000r with 160hp

[clivegto]

31 minutes ago, manden said:

if you can make the case accept the long stroke engine youre gonna get a killer motor. got a similar just an 1100 casing with 78mm modern pistons and its a little faster than a bmw s1000r with 160hp

This one is awesome 1052 bottom end with flowed dot head gsxr 750k cams my plan is to build one that spins up quickly & has 6 speed gear box.

[davecara]

@slingy1157did his 750 efi turbo using zx10 pistons iirc

[davecara]

Just thinking aloud here, but if using the flat top piston, to negate having to skim the head or lower the deck height could you use busa rods and Bush the little ends down?

[clivegto]

38 minutes ago, davecara said:

Just thinking aloud here, but if using the flat top piston, to negate having to skim the head or lower the deck height could you use busa rods and Bush the little ends down?

Don't think they fit the 750 crank.

[Cheeky4648]

2 hours ago, clivegto said:

Don't think they fit the 750 crank.

750 con rod big end is smaller than busa also rod length is significantly different. 

[Dezza]

I did not realise the 750 DOT head fitted the slabside engine. I have a Frankenstein 750/1100 engine with 750 slabside cases and a 1052 top end. It's obviously seen better days and needs attention but I am reluctant to keep the 6 speed box as the gears must be narrower than the 1052 5 speed and it's not as if these engines are lacking in low down and mid-range power. My aim is to use a bona-fide 1052 bottom end with 78mm wiseco pistons with the 1052 head and barrels from my Frankenmotor. Would a DOT head work with this or would the compression go through the roof? If the 1052 head is best what cams would be optimal?

[dupersunc]

With the wisecos and  the smaller Dot chamber, the cr will be too high, the valve to piston clearance will be marginal too.

[Dezza]

1 hour ago, dupersunc said:

With the wisecos and  the smaller Dot chamber, the cr will be too high, the valve to piston clearance will be marginal too.

Yep, that is what I was thinking

[clivegto]

9 hours ago, Dezza said:

I am reluctant to keep the 6 speed box as the gears must be narrower than the 1052 5 speed.

Yes they are but for fun so long as it's not to much power =  more fun.

[slingy1157]

On 7/28/2018 at 7:49 AM, davecara said:

@slingy1157did his 750 efi turbo using zx10 pistons iirc

Yep. Mine was stock shortstroke, bored to 76mm. Stock rods sleave to 17mm? I think. 04 zx10 pistons. Deck height was mere perfect from memory and used a stock 1052 head gasket. The big problem was CR. This was about 7.5-1, low even for turbo use, and this was already with a dot head obviously. CR would improve with a longer stroke a bit but I doubt a head skim would gain enough for NA running

[davecara]

Are the big ends different sizes between the 750 and 1100?