TOPIC:

I had these on the bike when I parked it for 15 years. Cleaned out the tank and ran them until I got new ones. Only issue is they can break if abused.
Steve

Steve and a few of his buddies trying to decide if this is the crank he's been looking for to eliminate any question about the 750 crank possibly
installed previously...

Must stuck working in the heat... I couldn't stand it myself.

Lookin good man. You are still at stock bore? 1015 Weisco's?

The heat just started today. Swamp cooler is acting up, had a box fan this morning while doing my jets. I have lots of low end. Coming home I was behind a plumbing truck. He wouldn't let me by. Instead of dropping down, I just rolled on the throttle and passed him. Can't wait for 500 miles to come. Using the power up and down, changing speeds etc. Has a deeper growl to her.
Yeah, 1015 and 10.25/1 pistons but with the 2.5mm drop, I'll bet it's more like 9-9.5/1. Good enough for me.
Steve

missionkz wrote: Steve and a few of his buddies trying to decide if this is the crank he's been looking for to eliminate any question about the 750 crank possibly
installed previously...

Now that's a crank.
Steve

What's the deck height on that Some of these marine deisel engines are the size of a block of flats, quite amazing really.


Yeah, 1015 and 10.25/1 pistons but with the 2.5mm drop, I'll bet it's more like 9-9.5/1. Good enough for me

I think about 1 point drop in CR for every 1mm, so down about 2.5 points? 10.25 - 2.50 = 7.75

Is it 8.5: 1 standard? If your head has been skimmed at all that will get some back. If the exhaust valve timing lines are just a bit higher than the gasket face it is one indication that the head has been skimmed.

About 3% power for every point of CR, so I guess you are down less than 10 percent. They do run nice and smooth though you have noticed.








www.daytona-sensors.com/tech_tuning.html

I'm going to do a compression test just to see.
Steve

A comp test at 500 and at thousand miles will tell you the real numbers. Mines at 165 last check so thinking its right at 10/1 or a hair under.

Whoops too slow.

Tyrell Corp wrote: What's the deck height on that Some of these marine deisel engines are the size of a block of flats, quite amazing really.


Yeah, 1015 and 10.25/1 pistons but with the 2.5mm drop, I'll bet it's more like 9-9.5/1. Good enough for me

I think about 1 point drop in CR for every 1mm, so down about 2.5 points? 10.25 - 2.50 = 7.75

Is it 8.5: 1 standard? If your head has been skimmed at all that will get some back. If the exhaust valve timing lines are just a bit higher than the gasket face it is one indication that the head has been skimmed.

About 3% power for every point of CR, so I guess you are down less than 10 percent. They do run nice and smooth though you have noticed.

Attachment Compression_Power.gif not found

www.daytona-sensors.com/tech_tuning.html

Looking at your chart makes me want to get a 903 crank. On the other hand, I shouldn't have any problems running regular gas.
Steve

I guess it's time to close this one out. If anyone has some info on the Z2 750 crank, rod markings, numbers on the crank throws etc. Please post them here. I am confident it is a 750 crank but little is available on identifying markings. I started the Poser thread in response to one members questioning my truthfulness. Rather than stoop down to his level, I did my best to prove what I claimed is true.
In the end, I satisfied the question if nothing more than to myself.
Steve

swest wrote:

missionkz wrote: Steve and a few of his buddies trying to decide if this is the crank he's been looking for to eliminate any question about the 750 crank possibly
installed previously...

Now that's a crank.
Steve

I went out to the Bar at Lunch and burned a fatty

That stuff makes me stupid. I don't do it anymore.
Steve