More Stress on the 20B block question??
#2
Lives on the Forum
Depends on what you kind of "stress" you're talking about?
Ultra high RPM's induce frequency and vibrational stress which is different than load stress from big power.
-Ted
Ultra high RPM's induce frequency and vibrational stress which is different than load stress from big power.
-Ted
#3
Senior Member
With under 20 psi boost I would say there is less stress on the boosted engine.
I've roadraced 1000's of kms without a rebuild. Not many pp guys can do that as the vibration causes water leaks around the devcon or filler used to fill the ports.
High rpm means high wear on bearings, apex seals, etc. Mazda states in their motorsports catalogue 8500 as a limit before things start to wear out exponentially. Not to mention the oiling requirements required. eg, high oil, pressure,dry sump,
I've roadraced 1000's of kms without a rebuild. Not many pp guys can do that as the vibration causes water leaks around the devcon or filler used to fill the ports.
High rpm means high wear on bearings, apex seals, etc. Mazda states in their motorsports catalogue 8500 as a limit before things start to wear out exponentially. Not to mention the oiling requirements required. eg, high oil, pressure,dry sump,
#4
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iTrader: (5)
With under 20 psi boost I would say there is less stress on the boosted engine.
I've roadraced 1000's of kms without a rebuild. Not many pp guys can do that as the vibration causes water leaks around the devcon or filler used to fill the ports.
High rpm means high wear on bearings, apex seals, etc. Mazda states in their motorsports catalogue 8500 as a limit before things start to wear out exponentially. Not to mention the oiling requirements required. eg, high oil, pressure,dry sump,
I've roadraced 1000's of kms without a rebuild. Not many pp guys can do that as the vibration causes water leaks around the devcon or filler used to fill the ports.
High rpm means high wear on bearings, apex seals, etc. Mazda states in their motorsports catalogue 8500 as a limit before things start to wear out exponentially. Not to mention the oiling requirements required. eg, high oil, pressure,dry sump,
#5
Senior Member
yes, i even raced it at the Edmonton indy support race this year, where we blew the tranny. next year we'll have a Jerico 5 speed.
My friend raced a pp 3 rotor for 4 years and had more problems than me, alot of them related to the high rpm's.
there are some pics at www.edmontonrace.com of the car.
its the silver one, #222.
My friend raced a pp 3 rotor for 4 years and had more problems than me, alot of them related to the high rpm's.
there are some pics at www.edmontonrace.com of the car.
its the silver one, #222.
#7
Senior Member
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#8
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iTrader: (5)
yes, i even raced it at the Edmonton indy support race this year, where we blew the tranny. next year we'll have a Jerico 5 speed.
My friend raced a pp 3 rotor for 4 years and had more problems than me, alot of them related to the high rpm's.
there are some pics at www.edmontonrace.com of the car.
its the silver one, #222.
My friend raced a pp 3 rotor for 4 years and had more problems than me, alot of them related to the high rpm's.
there are some pics at www.edmontonrace.com of the car.
its the silver one, #222.
Well that is what typically happens when you put a turbo on the same engine
#9
Senior Member
You are correct. This was only one full season with the 20b turbo.
But I have roadraced this car since 1997 and as a single turbo 13b (430 hp) since 2001. It took a few seasons to get the 13b turbo reliable in terms of cooling, fueling, tuning, etc., but it has been super reliable since 2003. A lot was learned over the last 6 years and that made going to the 20b less troublesome. I have no cooling issues!
My home track is Mission raceway, and it is the tightest track ever. Its mostly 2nd and 3rd gear, very slow corners( all 2nd and 1 third gear) . There are some guys with footage of their cars on youtube. type :mission raceway . Its tight!
All the races this year were in the summer and i had no heating issues. The key is a three pass Ron davis radiator, and THREE big oil coolers!(fluidyne) . And the rad is not obstructed by the intercooler. I started with two which almost worked, but this is a slow track. We ran it rich at 11.2 :1 just to be safe. Shifted at 7500. The tune was set at two boost levels. 14psi netted 590 rwhp and 18 psi netted 664 rwhp. I never raced it at higher than 14psi as it was already too much power for the stock tranny.
In the Edmonton race we qualified last due to a sheared tranny input shaft during Q1. We started the race last and got as high as 7th before a big crash cut the race short. I was very gentle with the throttle as the track was bumpy off a few corners and I didn't want to break again. Hopefully they'll have it again next year.
For 2008 i'm going mazdaspeed dry sump in hopes of going back to two oil coolers, penske shocks (done), and jerico 5 speed with tilton 3 disc.
wouter
But I have roadraced this car since 1997 and as a single turbo 13b (430 hp) since 2001. It took a few seasons to get the 13b turbo reliable in terms of cooling, fueling, tuning, etc., but it has been super reliable since 2003. A lot was learned over the last 6 years and that made going to the 20b less troublesome. I have no cooling issues!
My home track is Mission raceway, and it is the tightest track ever. Its mostly 2nd and 3rd gear, very slow corners( all 2nd and 1 third gear) . There are some guys with footage of their cars on youtube. type :mission raceway . Its tight!
All the races this year were in the summer and i had no heating issues. The key is a three pass Ron davis radiator, and THREE big oil coolers!(fluidyne) . And the rad is not obstructed by the intercooler. I started with two which almost worked, but this is a slow track. We ran it rich at 11.2 :1 just to be safe. Shifted at 7500. The tune was set at two boost levels. 14psi netted 590 rwhp and 18 psi netted 664 rwhp. I never raced it at higher than 14psi as it was already too much power for the stock tranny.
In the Edmonton race we qualified last due to a sheared tranny input shaft during Q1. We started the race last and got as high as 7th before a big crash cut the race short. I was very gentle with the throttle as the track was bumpy off a few corners and I didn't want to break again. Hopefully they'll have it again next year.
For 2008 i'm going mazdaspeed dry sump in hopes of going back to two oil coolers, penske shocks (done), and jerico 5 speed with tilton 3 disc.
wouter
#10
I'll blow it up real good
iTrader: (1)
All the races this year were in the summer and i had no heating issues. The key is a three pass Ron davis radiator, and THREE big oil coolers!(fluidyne) . And the rad is not obstructed by the intercooler. I started with two which almost worked, but this is a slow track.
Have you tried Evans coolant?
Mind sharing a few pics of the ic/rad/ducting setup?
#11
Senior Member
I used a stock fd water pump. My friend with the 3 rotor pp used evans and swears by it but since I haven't had any problems it seemed like another expense that i didn't need. He used a stock water pump with large pulleys.
I have heard the stock water pump will cavitate at rpm's over 7500 so that may affect some engines.
I've never been successfull at posting pics. I am not great with the computer. The car is in pieces so there aren't too many pics available until spring.
wouter
I have heard the stock water pump will cavitate at rpm's over 7500 so that may affect some engines.
I've never been successfull at posting pics. I am not great with the computer. The car is in pieces so there aren't too many pics available until spring.
wouter
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