I need to have the rotating assembly balanced and the rotors clearanced for an engine that I am building. I was going to send it to Paul Yaw but since I sent the email inquiring about it 3 days ago and recieved no reply I am lead to believe that his customer service flat out sucks and I am leary of sending parts to him, especially since the engine is going in my daily driver. This leaves Racing Beat and Mazdatrix. Racing Beat's balancing is rather expensive but Mazdatrix flat out sucks ***** at packing rotating assemblies and they end up damaged like Guitarjunkie's was. They did send him a new rotating assembly but I need this car to be drivable by the end of the year or I am SCREWED so I can't afford to have someone set me back because of carelessness. Pretty much what I'm saying is I need someone who will do good work and not **** around because this engine needs to be reliable and get finished quickly because right now I have no car. Who should I send the stuff to?

PS: I also need to have my irons resurfaced.

 

Racing Beat, or Nick Nugteren of Rotary Reliability and Racing

Telephone: (714) 839-8018
FAX: (714) 641-9381
Santa Ana CA

http://rotaryracing.com/

I believe $200 to balance, $600 to build with yours or his parts

 

Paul Yaw is actually very good. He does everything properly and is very thorough. He just gets tons of e-mail everyday and doesn't get to them very fast. Add to the fact that he stays very busy in the shop and you can see why is so slow. He isn't a large business and only has 1 or 2 other guys helping out. If you want to get ahold of him, call him. His phone number is on his website.

 

here's a related thread you might find helpful.

https://www.rx7club.com/showthread.p...ight=balanc%2A

 

I couldn't find a number on his site.

 

Nobody knows Yawpower's number?

 

Use www.bigyellow .com and type in the business name-
Yaw Power Products
21639 North 14th Avenue, Phoenix, AZ 85027
(623) 780-4931

 

Thank you. Now maybe I can finally get this thing going.

 

have you checked out the pricing on the RB Super Light Weight rotors? DAAAAMMMMNNNN! $1,850! no thank you, i'd go with someone else, or is there another section where they advertise machining your rotors and counterweights to be lightweight?

 

quick question, im new to rortaries, so when you say balancing and clearencing, wat does tha mean?

 

i'm not sure what clearancing entails, but balancing means that they remove material from the front & rear counterweights, and the rotors, to allow the engine to rev higher, then they make sure that the whole rotating assembly spins in harmony, no heavier or lighter spots anywhere, so they spin truer, and will allow you to rev higher.

 

quick question on the balancing procedure ...

i'm going to get my rotating assembly balanced. i'll be using a lightened flywheel for an SE on my 12A buildup so i can use the clutch off my 13B when it comes out. however, i don't have the 13B front counterweight to go with it (and i'm not too keen on having to buy one, either). what i want to know is if it matters? since they will be balancing it all anyway, i should be able to get it done with the 12A front counter, no?

thanks.

 

You are heading toward disaster

 

would you care to elaborate???

 

send it to fort wankel, chuck does great work, he just finished building a 13bt that will make around 600hp he is ss124a on here i think. i know that is what his aim is.

 

gilmore03: clearancing is when material is removed from the rotor to make it smaller, so under racing (read: sky high redline) conditions, as the eccentric shaft flexes, the rotors wont contact the housing in a horrible, horrible way. When you finally take one of these apart you'll see that the moving parts are quite heavy and can do alot of damage if they arent in their respective locations. I call the spare e-shaft lying around my room the "Eccentric Club".. it must weigh 10 lbs

 

Balancing from an unbalanced condition of using 13b flywheel with a 12a front counterweight (early or late model ?) may not be obtainable; all the use a 13b clutch, ... just replace the clutch.

 

The counterweights should always match the weight of the rotors. Standard flyhweels have the counter balance built into it from the factory. Aftermarket lightened flywheels however, have a neutral balance which is why you need to use the rear counterweight from an automatic Rx-7. The auto rear counterweight is also what the new flywheel bolts on to.

N/A clutches and flywheels can be divided into two categories... 8.5" (74 - 82) and 9" (83 - 92). These are interchangeable but as long as the flywheel and clutch are both the same diameter obviously.

So basically what you need is: 12A front and rear counterweights that are the same year as your rotors and a lightened flywheel that is the same diameter as the clutch you already have. In reality you could use any counterweights seeing as you're having them rebalanced but getting the right ones will mean less work/cost invloved.

 

See? This is what I figured, but I was looking for confirmation. In all honesty, I forgot all about the 225 mm thing from 1983 to 92 so that's my bad. It's been a while ...

However, I figured if I had to start from scratch with a full balance, then it shouldn't matter which you have. The person balancing will get it done. I'll just get the aftermarket flywheel for my 12A since the clutch will bolt up.

Thanks, Revhed.