Bisimoto H/F series aluminum flywheels

[turbo90accord]

youll be very happy with it! i love mine!

[BB6-SH]

youll be very happy with it! i love mine!

Mine is getting put in 2morrow at Blacktrax Performance cant wait to see how it feels.

[Granite CB7]

Either Bisi or Robert: Would my Bisimoto/Evolution flywheel qualify for the warranty if after 18K miles I can pull the pilot cartridge bearing straight out by hand? It's no longer a press fit anymore and I can literally pull it out w/ 1 finger. I noticed this when I was installing my new clutch but it was too late, I had to throw the flywheel back in as is, I needed the car back together asap. I've been meaning to call but I've been alittle busy. So, would I qualify for another flywheel?

Also, why does the flywheel weigh 9 lbs 13 oz? It is not 8.9 pounds like advertised.

Dan

[nostringz]

too bad i'm an automatic... but WOW bisi, you really have our back on cb7 don't you!

[drummersteve7]

Flywheel Stud Diameter Issue

Well a lil disappointed in the fab setup on this flywheel.
Kinda interested in what happened with this particular issue:

Our Issue:
So H22anow hits me up explaining he has a Bisi Flywheel and new clutch.
He plans on installing these components. He comes over to the house, mind you a 2 hour drive.
We get the tranny removed and old clutch and flywheel removed as well.

At this point we stop to eat some well deserved 4 hour Smoked Pork Ribs
smoked by yours truly! Pretty descent, not to bad of ribs.

Back to it and time for installation. On goes the Bisi Flywheel!
H22anow is very excited at this point, because it looks killer.
I install clutch plate and the alignment tool that came with his new clutch does not fit into the flywheel.
Luckily I have my own alignment tools from past experiences.

Flywheel and Clutch --> Installed.
Time for the pressure plate and we can not, for the life of us get it to fit on the flywheel. After some thought this is what we found:

Bisi flywheel studs (Bigger than OEM, unable to install pressure plate):


OEM Flywheel Studs:


You can clearly see that the OEM studs are smaller in diameter.

Thumbs down to the next process, I mean to have to do this because a $260 or so flywheel is incorrect.


After tons of hesitation to actually drill the stud holes out.
By the way we used an 11/64 Drill bit for those that have similar problems.

As H22anow was a customer, I became worried. I recomended not drilling the pressure plate. But he lives 2 hours away, so what to do you know?
So we drilled!

Everything was put back together, and I was just notifiedthat the drive hoe was a success.
Now I can drink beer, knowing I do not have to go rescue him!

All in all I would say that is a pretty crappy deal, and I am sure h22anow will deal with Bisi as he desires.
But I thought people should know and was wondering if anyone else had similar issues.

I have a Bisi flywheel and no issues with mine. So not exactly sure what happened.
But it definetly took a nice little chunk out of our day, with some small worry's!

[do2mind]

... I take off like normal, and use a/c too! It is a misconception that lighter drivetrain mass = less drivability and high rpm take offs...

I hate to disagree with "the master"... but a with a lighter flywheel, you do need to give more gas on takeoff from a dead stop, especially if you're not a naturally aggressive driver. My dad drilled me on smoooooooooth takeoff... which has always served me well in having very low wear on an OEM clutch... but I did have to adjust my driving style when I lightened the flywheel, because otherwise I was stalling out at stoplights about once a day.

Once you get used to it (which you obviously are, and which I am also now)... then your statement is true.

[CB7Man]

I hate to prove the noob wrong Im kidding
Im able to start the car with no throttle and I have an 8lb Fidanza
Sure it takes a little longer...
I dont give the car anymore gas then someone with a 30 pound flywheel.
Then again, I start pretty fast, I hate burning clutch.
Saving the clutch is all about low RPM.

I've driven a couple other CB's with OEM flywheels, nothing is different except the rev speed. Sucks to try and rev-match too.

The only upside to an OEM flywheel is the ability to start the car on level ground with no throttle....woohoo


I still get 31mpg (combined) with my 8lb flywheel.


And to the guy with the flywheel issue.
Doesnt Bisi sell custom clutch kits for his flywheel?
Probally did that so you have to buy his clutch kit when you buy the flywheel.

The bolts that hold the PP on is centering the pp anyway, I woudlnt worry about it.

[drummersteve7]

I know you wouldn't worry about it. That is a typical noob response.

I just believe its not right, that you spend so much money to have a problem.
And no it is not meant to buy together, he uses ACT clutches.

I have a Bisi flywheel and my pressure plate went on with zero issues.
It is clear in the pics that his studs (on this particular flywheel) were wrong.
Luckily for H22anow, everything worked.
When you start getting into engine work and you notice something does not fit quite right, it angers
you because you do not forsee the potential problems in the future.

[illestatus]

And to the guy with the flywheel issue.
Doesnt Bisi sell custom clutch kits for his flywheel?
Probally did that so you have to buy his clutch kit when you buy the flywheel.

The bolts that hold the PP on is centering the pp anyway, I woudlnt worry about it.

it is very unlikely for them to have done that on purpose, i will give them a call this week coming up because this means that i will have to tap into all of my future pressure plates from now on....but of you course "you would not worry about it"

[turbo90accord]

I hate to disagree with "the master"... but a with a lighter flywheel, you do need to give more gas on takeoff from a dead stop, especially if you're not a naturally aggressive driver.

I never had any drivability issues with the bisimoto flywheel. It took off from a stop as normal. and that was with a clutch masters stage 4 6puck clutch.

[CENTER]Well a lil disappointed in the fab setup on this flywheel.
Kinda interested in what happened with this particular issue:

Are you sure that your fitment issues were not caused by the corrosion present of that pressure plate? Also i noticed that in the pic of the pressure plate the hole to the left is the same size and the dowel pin on the flywheel. are you sure you were putting it on right?

Only reason why i question it its that i have installed 3 different bisi flywheels and all of them allowed perfect mating of the clutch with no modifications needed whatsoever. I wonder if you could measure and post a pic of the dowel that is on the OEM flywheel that got replaced.

[drummersteve7]

yah man. I posted both pics above.
corrosion does not destroy about 6-8cm of material.
no I have 3 different H22 flywheels. all which fit the pressure plate fine.
In my pics labeled are BISI's horribly big stud on the flywheel plate.
and the other is oem that was replaced.

It is pretty self explanatory.

Does anybody have another BISI flywheel floating around to check pin size.

Yes it is installed correctly. wowsers...reading owns!
This plate is just the wrong size! over.

[cloudasc]

Did h22anow get the flywheel directly from bisi? If so maybe the wrong flywheel got shipped out. Otherwise if it came from someone other then bisi, h22anow might have been mislead that it was for an h22. So where did h22anow aquire the flywheel from? Maybe it was for a b or k series motor. Just something to think about.

[drummersteve7]

he got it straight from Bisi! They claimed it was the last one.

My thinking: It is a different flywheel, but diameter was same.
So they shipped it thinking hey if he doesn't complain we can sell more like this and save some money.
Not positive but this is my THOUGHT/OPINION. I have been wrong before and can admit when rightfully so.

[illestatus]

The flywheel was ordered straight from bisi, when I got the box aside from the Bisi sticker/lic plate cover/ signed picture, I got the vac sealed flywheel with " h-series flywheel" cover sticker on it.

[do2mind]

"Driveability"

Re: driveability of lighter flywheels with racing clutches.

Different drivers drive differently.

Driver A may never be close to stalling because he always gives plenty of gas on startup... light flywheel, heavy flywheel, whatever.

Driver B may never be close to stalling because he always slips the clutch for an extra half a second... even if he doesn't give it extra gas, he never stalls, light flywheel, heavy flywheel, whatever.

Driver C may be fairly close to stalling every time he starts from a dead stop, because he engages the clutch fairly quickly but with not a lot of gas. It takes quite a bit of practice, but this way can be silky smooth, and very easy on a clutch... I put 264,000 miles on the clutch of my last car, when I sold that car the original clutch was still going strong.

I am driver C... and in any car with a decently light flywheel and a decently firm clutch, I have to be a little more like Driver A, or I stall. Doesn't matter if it's a CB7, a BMW, whatever.

Driver C's have driveability issues with lighter flywheels... until they learn to drive more like A or B. I chose A... but I am still close to that edge... I just had to learn where that edge is with trial and error.

If you're saying you have no issues with driveability with a lighter flywheel, then you are either driver A, or driver B.