0PISTONS

I am building a 13B Streetport for my FB and hope to throw down close to 200 at the wheels. The motor will probably see 8500 every once in a while but very rarely - the optimum shift point will be below that. Is it necessary for me to buy hardened stationary gears, 3 window bearing, etc.? I'm on a very tight budget so I am trying to save money where I can so I dont cheap out on something important.

l8t apex

engine builders here will address this better. i answer only cause of what I have had.I have run the **** out of stock stuff in years of racing.

Good oil pressure and fuel tuning go along way. I feel that stock stuff blue printed and balanced by a proffessional will give you a good motor.

The other stuff is great if you have the money and staying in the 7 to 10,000 range. Weve run plenty of enduros hitting 8+

BigTurbo74

using stock fd gears, oil pump and regulator, and bearings you will be fine.

mazdaspeed7

All the stock S5 stuff is safe to 8500 rpm

1Revvin7

[quote name='mazdaspeed7' date='May 25 2005, 02:02 AM']All the stock S5 stuff is safe to 8500 rpm


[/quote]



Agreed.



A series4 t2 of mine saw 8500rpms daily for 7k miles. Its still running just fine. I have not seen any bearing material or anything abnormal in the oil filter either.

R.P.M.

Ok so how would one get a motor "blueprinted and balenced" ??

diabolical1

[quote name='R.P.M.' date='May 25 2005, 07:26 PM']Ok so how would one get a motor "blueprinted and balenced" ??


[/quote]

from what i think i understand of it, you measure everything (particularly bearings)and record it, then choose a value at the higher end of tolerances and try to build the engine with parts that are as close as possible to that value. it's a time-consuming process and it's not for the impatient or people that think "oh ... this is good enough."



OR



have someone do it for you.

mazdaspeed7

[quote name='diabolical1' date='May 30 2005, 12:10 PM']from what i think i understand of it, you measure everything (particularly bearings)and record it, then choose a value at the higher end of tolerances and try to build the engine with parts that are as close as possible to that value. it's a time-consuming process and it's not for the impatient or people that think "oh ... this is good enough."



OR



have someone do it for you.


[/quote]





Not all clearances necessary should be on the high end of the allowable limit. For instance, Ito has found better reliability from setting the clearance between the side and corner seals on the loose side on high power turbo motors, but a n/a motor, or a mild turbo motor might work better with tighter clearances. Thats just one example, clearances are yet another thing thats a compromise. What may work good for one setup wont necessarily work good for another.

diabolical1

very good point



when i posted i was actually talking about a normally-aspirated application, but i see what you're saying and as i think about it some more i can see where being a little more loose would be beneficial some cases.



thanks.