Identifying engines

[misterleon]

Hey guys I bought a second hand 5t and am wondering if there is an easy way to identify what bore I have in the truck. I know it’s a Zenoah cy engine, but that’s about it.
*zenoah on the head and then it say cy on the flywheel housing***

 

[TODD]

A quick and dirty way is the cylinder will had a threaded cast in boss on the back near the transfer port bulge. Left side of cylinder are 34mm bores and if boss is on right side of cylinder it is a 36mm bore. Quick and dirty but it is quick way. BUT keep in mind you do not know if it is stroked or not in the crank

 

[misterleon]

A quick and dirty way is the cylinder will had a threaded cast in boss on the back near the transfer port bulge. Left side of cylinder are 34mm bores and if boss is on right side of cylinder it is a 36mm bore. Quick and dirty but it is quick way. BUT keep in mind you do not know if it is stroked or not in the crank

Thanks Todd, not exactly sure what a threaded cast is or a transfer port bulge, but I’ll google it

 

[DougStar]

Id put money on that its a cy29 ?

 

[AnubisBC]

Another one? Man, you're on a roll! Probably a Zen head on a stock Fuelie/CY bottom end. This was pretty common in the early days. Is the engine a 2 or 4 bolt head?

 

[DougStar]

Another one? Man, you're on a roll! Probably a Zen head on a stock Fuelie/CY bottom end. This was pretty common in the early days. Is the engine a 2 or 4 bolt head?

Good question ?? please be a 4 bolt?

 

[neeper]

On fan side, near the bottom of the head should be some numbers that tell you crank length and piston size. Removing the coil helps.

28-32 is 23cc
28-34 --26cc
28-36---28.5cc
28-35---27cc

 

[Phill2]

Hey guys I bought a second hand 5t and am wondering if there is an easy way to identify what bore I have in the truck. I know it’s a Zenoah cy engine, but that’s about it.
*zenoah on the head and then it say cy on the flywheel housing***

Probably a Zenoah.
You have to put a CY fan cover on to match the bolt holes in the chassis.

 

[AnubisBC]

Probably a Zenoah.
You have to put a CY fan cover on to match the bolt holes in the chassis.

Not quite. I have a Zen fan shroud on my stock Fuelie/CY and the bolt holes line up just fine.

Edit: I was thinking of the shroud and not the cover, so you are correct @Phill2

I don't think any of us can actually make an educated guess without pics.

 

[Phill2]

Not quite. I have a Zen fan shroud on my stock Fuelie/CY and the bolt holes line up just fine.

I don't think any of us can actually make an educated guess without pics.

Very strange.
I've had to swap fan covers every time.

 

[mark35]

Seeing as it seems to be a zen head on cy case I think there is a good chance its a ported head esp 28.5 would be my guess, we are guessing right? ?

 

[Wolle]

Probably a Zenoah.
You have to put a CY fan cover on to match the bolt holes in the chassis.

I think so too, it will be a Zenoah engine with the CY cover to match the srews to the chassis.

 

[DougStar]

+1??

I think so too, it will be a Zenoah engine with the CY cover to match the srews to the chassis.

 

[Seandonato73]

It's a supercharged mini v8 making upwards of 1000hp.? since were being funny ?

 

[misterleon]

Thanks guys I’ll post pics in a few hours

 

[Polar_Bus]

On fan side, near the bottom of the head should be some numbers that tell you crank length and piston size. Removing the coil helps.

28-32 is 23cc
28-34 --26cc
28-36---28.5cc
28-35---27cc

Great info, I was wondering how to accurately identify engines. Up to 32cc's seem to be a common crankcase configuration, then once you have 34cc+ the cases are different. I found this out when I was hunting for replacement gaskets and crank seals for my CY 36cc engine.

 

[misterleon]

There’s no identifying numbers that I could find but here are some photos

Another one? Man, you're on a roll! Probably a Zen head on a stock Fuelie/CY bottom end. This was pretty common in the early days. Is the engine a 2 or 4 bolt head?

It’s a 4 bolt

 

[Striikar]

I bought a motor and wanted to verify the size as it had no markings. A quick way I did it was to take a piece of cardboard or any not to flexible material and cut it to about 4-6 inches.
Then I turned engine over till I could see other side of cylinder wall. Insert cardboard/plastic etc till it touches other wall. Then mark the cardboard on your side . Then simply measure the length of end of cardboad to your mark. That should give you cylinder/ bore hole size.
Bore holes size:
32mm - 23cc
34mm --26cc
36mm---29cc
35mm-+.5
These seem to be the standard but there are variations also ie : 27.5/28.5/29.5
The other measurement is stroke,that combined with bore determines total cc.
Stock length rods are 28mm.
28/29/30mm length rods changes the volume size between 23cc-30.5cc.
Stroke is the distance the piston travels up and down. Bottom - Top dead center.
If have caliper you can measure also.
You can measure how far up + Down the piston travels for stroke.
Its early so bound to be some error somewhere. Feel free to correct them.
Just short dirty explanation of engine displacement.

 

[mark35]

Looking at the pics I think it it a ported stroker kit on a cy case I'll tell you why.
1 it has a cy clutch
2 as we know it's a zenoah head which is the perfered cylinder by tuners
3 the exhaust port looks like it's been enlarged
4 it has a big arse copper base gasket, probably because it has a +2 stroker crank.

Ba bum tss
https://tse1.mm.bing.net/th?id=OGC....mxGPnYre/giphy.gif&ehk=6J6HSdEVHj2cJPWZTJ0cOQ
Of course I could be way wrong???

 

[Striikar]

I agree.✔
It's crazy how hard it is without markings to know for sure.
I have similar motor,no marking was "told", it had it was 29cc with a ported head. I had to measure to be sure. I just didn't realize the damage to the block until after getting it,of course - "Due to the nature of the hobby, No returns". ?