Discussion
Hello guys,
I would like to buy a Radical only for Trackdays, I have to choices:
SR3 only 30 hours or a older SR5 with some trouble with ECU motor but cheaper.
1. Why the SR3 is so popular even with motor rebuilt exigences?
2. Do you know people whom use it more than 30 hours before rebuilt whithout problems? 40. 50 or more hours?
3. Bigger is the motor, less iti is reliable? 1585 or Turbo?
4. What do you think about SR5 choice? Seems to me that Radical stopted production of it?
5. SR5 owner advices are welcome
6. What Radical change inside motor during rebuilt process?
7. Almost not ads for SR5, do you know one for sale?
As you can see questions of newbie... Thanks a lot for your help.
Raoul
I would like to buy a Radical only for Trackdays, I have to choices:
SR3 only 30 hours or a older SR5 with some trouble with ECU motor but cheaper.
1. Why the SR3 is so popular even with motor rebuilt exigences?
2. Do you know people whom use it more than 30 hours before rebuilt whithout problems? 40. 50 or more hours?
3. Bigger is the motor, less iti is reliable? 1585 or Turbo?
4. What do you think about SR5 choice? Seems to me that Radical stopted production of it?
5. SR5 owner advices are welcome
6. What Radical change inside motor during rebuilt process?
7. Almost not ads for SR5, do you know one for sale?
As you can see questions of newbie... Thanks a lot for your help.
Raoul
The SR3 is very popular because it gets raced in the UK especially. Most new rads are bought for racing and then some go on to be track day cars.
The accepted wisdom is that track day hours are less strenuous than race hours. Also R are looking at running 1500 engines to 40 hours as the 1340s do.
One of the problems for the 1500 is that the gearbox tends to be weaker and has a chance to start failing first. I've not got a huge sample, but regarding the 4 failures over the years, I've had one engine (the 1300 dropped valve) and 3 gearboxes fail.
The big problem is when you are running on borrowed time - how long do you go? The 1300 last year was on unknown hours. It was fine until it wasn't!
Bert
The accepted wisdom is that track day hours are less strenuous than race hours. Also R are looking at running 1500 engines to 40 hours as the 1340s do.
One of the problems for the 1500 is that the gearbox tends to be weaker and has a chance to start failing first. I've not got a huge sample, but regarding the 4 failures over the years, I've had one engine (the 1300 dropped valve) and 3 gearboxes fail.
The big problem is when you are running on borrowed time - how long do you go? The 1300 last year was on unknown hours. It was fine until it wasn't!
Bert
I don't think I've ever seen a SR5 for sale they do seem to be pretty rare, perhaps the high revs and lightness of the bike engines helps the SR3's cause but more down to the racing as B^2 says. Pretty sure you double or triple the max hours for trackday or road use?
From the 2006 SR3 manual:-
"It is important to log the number of hours the engine is run. The engine should run for no more than 30 racing hours before being returned to the factory for a rebuild. If the engine is stressed less (i.e. trackday or road use) the car should be returned to the factory every 30 hours for a rolling road dynamometer test. Engines which are not raced, regularly cover 90 hours without requiring attention."
So dyno run every so often (and probs compression test) to check the health and go from there?
Dunc.
From the 2006 SR3 manual:-
"It is important to log the number of hours the engine is run. The engine should run for no more than 30 racing hours before being returned to the factory for a rebuild. If the engine is stressed less (i.e. trackday or road use) the car should be returned to the factory every 30 hours for a rolling road dynamometer test. Engines which are not raced, regularly cover 90 hours without requiring attention."
So dyno run every so often (and probs compression test) to check the health and go from there?
Dunc.
Edited by dunc_sx on Friday 2nd November 09:36
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