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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 14:11 #395445

  • zed1015
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Getting bored after completing the Drouin so time for another ZED project.
Someone said you'll never get a 1000 motor in a 750 Zephyr frame.
So o o o ! ! ! Never say never :lol:

Quick mock up.
Low comp Wiseco 1428 big block, Geep 11 twin plugged head, Mk2 welded crank, MTC Lock-up clutch, Srad swinger, Zx10r running gear.
Turbo or supercharger to be decided,
Whatever comes cheapest :)



Donor 750 Zeph frame. Motor is tight. Touches everywhere and more.



Cantilever suspension would look good.


Motor goes in but lower frame rails are out.











Zx10 running gear and srad arm fitted.


Change of plan for suspension,
Now gone rising rate.
Gixer 1000k swinger, 750 Srad linkage, Bandit 6 shock with Yam R6 spring.





On it's wheels.
Engine is stressed member.


Needs any alloy tank sitting on those sloping top rails and a single seat to complete the look.

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Last edit: by zed1015.

New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 14:21 #395447

  • larrycavan
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Interesting project :)

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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 15:10 #395456

  • testarossa
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I like the look of the mockup, but I have some questions. Was the original zephyr frame using the motor as a stressed memeber? I'm guessing no. Also, using this particular motor as a stressed member it looks like the rear end is attached at the lower case and the front end is attached at the upper case, so essentially you have 17 x 6mm bolts and a bead of adhesive to take the strain. Does this concern you, or do you have plans to brace the motor additionally? I have never seen this done before, and I am curious if it will hold. Have the Bimota frames used the motor as a stressed member, I can't remember?

Looks cool, I like all the black and gold. Keep up the good work.
1978 KZ1000 A2 Click--->Build Thread
2004 ZX-10R
2007 Harley Sportster 1200
2020 Harley Street Glide Special
Angola, IN

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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 15:28 #395463

  • hocbj23
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Back in the mid 50s,Zundapp built a lovely 250 two stroke with the motor as a stressed member.There was no front downtube at all.As best I can remember,the motor was "slung" underneath the top tubes and attached there plus at or near the rear swing arm.Looked a little funky but very rigid and handled very well.Looks like ur mockup has a lot of downforce precisely where there is no support=frame cracks if not well braced.bj

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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 16:27 #395474

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Engine is mounted in three places which forms a triangle(Very rigid) two at the back and one at the front.just like the GPZ11.
Cases are bolted together by the 6mm bolts and TWELVE 10mm HD studs at the crank As well as all the bolts on the side covers.
If that lot can hold together in a 300hp + drag bike then i don't think it's gonna drop out of the frame :laugh:

There are plenty of examples using the zed motor as a stressed member.

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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 18:31 #395492

  • Old Man Rock
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What 750 frame, there's nothing left of it.... :blink: :laugh: :laugh: :laugh:

I LUV this modding stuff, sooooooo coooooool! B)

Keep them images coming...

OMR
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
Keihin, 29mm CR specials
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter

Phoenix, Az

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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 20:10 #395507

  • PLUMMEN
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its gonna be hard finding turbo pistons off the shelf for a motor using gpz head,best thing i came up with was 10.25:1 kz pistons with j style head,brings you down to around 8.25:1-8.75:1 depending on who you ask B)
Still recovering,some days are better than others.

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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 21:21 #395514

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mtc and pitstop can make it happen.
1976 kz900 in parts but will be going some day soon
1980 kz1000G1
1976 kz900 parts bike
1979 kz1000 shaftie parts bike
1978 kz1000 33mm smoothies 1075 kit
Troutdale Oregon USA

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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 21:28 #395515

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www.mtceng.com/index.php?option=com_k2&v...0/1000&Itemid=100158

Not sure what the static compression difference is with the GPZ head, but 7.8:1 for Kz900/1000 - that seems like it wouldn't be a J head static compression number.

I'm *definitely* subscribed!

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New project.1428 turbo or supercharged, Who knows? 01 Sep 2010 21:30 #395516

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Do you have the three mount points done already on the engine? Any better shots you could post? I'm extremely curious about the stressed member idea...

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New project.1428 turbo or supercharged, Who knows? 02 Sep 2010 00:20 #395528

  • zed1015
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PLUMMEN wrote:

its gonna be hard finding turbo pistons off the shelf for a motor using gpz head,best thing i came up with was 10.25:1 kz pistons with j style head,brings you down to around 8.25:1-8.75:1 depending on who you ask B)


Anywhere from 6:1 to 8.5:1 will do the job.
I already have the 8:1 wiseco's
Gpz head knocks that down to 6:1
Head has enough meat on it to safely remove 1.3mm without getting too close to the valve seats which brings it back up around 7.5:1.
This is exactly what i did with the Drouin supercharged 'Z' .

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New project.1428 turbo or supercharged, Who knows? 02 Sep 2010 04:37 #395543

  • testarossa
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zed1015 wrote:

Engine is mounted in three places which forms a triangle(Very rigid) two at the back and one at the front.just like the GPZ11.
Cases are bolted together by the 6mm bolts and TWELVE 10mm HD studs at the crank As well as all the bolts on the side covers.
If that lot can hold together in a 300hp + drag bike then i don't think it's gonna drop out of the frame :laugh:

There are plenty of examples using the zed motor as a stressed member.


I just noticed the upper rear mounts, and that's a good point about the 10mm bolts. I totally forgot about those. Looks like you are off to a good start. I can't wait to see the finished product. Will you post details along the way?
1978 KZ1000 A2 Click--->Build Thread
2004 ZX-10R
2007 Harley Sportster 1200
2020 Harley Street Glide Special
Angola, IN

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