809bhp on the rollers, Sierra Cosworth.
Discussion
rhinochopig said:
Please don't take this the wrong way, but why so little power, relatively speaking (without NO2) - what's the limiting factor at the moment, is it a budget thing or an attempt to maintain an element of reliability or drive-ability or are you at the limits of the block?
What a strange thing to say, lets see their 2 litre pump figures 
. Are you thinking mine is a competition engine like Simons mine makes 780 on pump & cant make good use of race fuel its not designed to do that. I expect Simon is on 109 or maybe even 120ron you cant compare the two. The trip to the Chinky would be rather noisy in Simons me thinks. Mines used all the time at 2.8bar & is fully trimmed.
Simon Dynoed my engine so i know him well, when you speak to him just ask whos proven Topspeed is faster the EVO or the Cossie
.The YB is ignition limited gasket integrity is the problem. Julian Godfrey leads the way & is at 874bhp with the Tebenham drag engine, his attempts at a reliable 900 are proving difficult.
Mine made 838(780 pump) on Simons Dyno but is circa 850 with the latest mods so we are close to the practical limit.
MADRod said:
rhinochopig said:
Please don't take this the wrong way, but why so little power, relatively speaking (without NO2) - what's the limiting factor at the moment, is it a budget thing or an attempt to maintain an element of reliability or drive-ability or are you at the limits of the block?
What a strange thing to say, lets see their 2 litre pump figures . Are you thinking mine is a competition engine like Simons mine makes 780 on pump & cant make good use of race fuel its not designed to do that. I expect Simon is on 109 or maybe even 120ron you cant compare the two. The trip to the Chinky would be rather noisy in Simons me thinks. Mines used all the time at 2.8bar & is fully trimmed.
Simon Dynoed my engine so i know him well, when you speak to him just ask whos proven Topspeed is faster the EVO or the Cossie
.The YB is ignition limited gasket integrity is the problem. Julian Godfrey leads the way & is at 874bhp with the Tebenham drag engine, his attempts at a reliable 900 are proving difficult.
Mine made 838(780 pump) on Simons Dyno but is circa 850 with the latest mods so we are close to the practical limit.
Driving that must be one hell of an experiance.
It's also very nice to see sensible exhaust pipe rather than bucket exhausts and clearly proves they are most certainly not required for producing more power quite the opposite.
Would you ever consider a supercharger to aid the relatively limp - joking - 280bhp up to 5,400rpm. It would improve the total area under the power v revs curve.
Question to the owner do you run 97ron or 99ron. Also if you did use 109 or 120 ron what would that mean in power terms? Naive I know
It's also very nice to see sensible exhaust pipe rather than bucket exhausts and clearly proves they are most certainly not required for producing more power quite the opposite.
Would you ever consider a supercharger to aid the relatively limp - joking - 280bhp up to 5,400rpm. It would improve the total area under the power v revs curve.
Question to the owner do you run 97ron or 99ron. Also if you did use 109 or 120 ron what would that mean in power terms? Naive I know
rhinochopig said:
engine tuning has come a long way since the YB was built and there seems to be increasingly more and more 2 litre drag engines running on race fuels making well into 4 figures on the dyno.
Mitsibushi 4G63 - amazing figures from a 4 cylinder. Think it was AMS in the states who recently ran 230mph on 1200 odd wheel hp.Some people would have you believe that that power transition is "nearly" the same as VTEC kicking in. I can tell you that is not the case though..... However an increase of 67bhp can be difficult on a damp morn' so 500bhp must be stupidly stupidly mental mad madd maddd bonkers nuts.
Brilliant. Love it! You have a "kill all" style throttle, kind of .50 magnum , then H bomb.
Gwiz
Brilliant. Love it! You have a "kill all" style throttle, kind of .50 magnum , then H bomb.
Gwiz
Welshbeef said:
I'll make do with my 77bhp/ltr & 123ftlb/ltr.
I can imagine that the transition from 280bhp to 809bhp in 1200rpm is rather entertaining. If you can open the throttle wide open at the 280bhp level isit a case of no matter what gear you are in traction will be lost?
Full boost is about 5k in the car not the 6k it shows on that graph. Think we gain 500bhp in 400rpm or something silly. But we do have traction as the cars been developed along with the engine. It has a 10.5" jag power loc,full beam kit, chassis connectors, coilovers etc.I can imagine that the transition from 280bhp to 809bhp in 1200rpm is rather entertaining. If you can open the throttle wide open at the 280bhp level isit a case of no matter what gear you are in traction will be lost?
Rod, a question if I may.
When the RS500's came to an end in the touring car championship, I read an interview with, IIRC, Andy Rouse, who said they were pushing 600bhp back then and going through a clinder block per race.
What has changed in the years since to allow people to run so much more power without such frequent rebuilds?
When the RS500's came to an end in the touring car championship, I read an interview with, IIRC, Andy Rouse, who said they were pushing 600bhp back then and going through a clinder block per race.
What has changed in the years since to allow people to run so much more power without such frequent rebuilds?
Megaflow said:
Rod, a question if I may.
When the RS500's came to an end in the touring car championship, I read an interview with, IIRC, Andy Rouse, who said they were pushing 600bhp back then and going through a clinder block per race.
What has changed in the years since to allow people to run so much more power without such frequent rebuilds?
They were racing with 540bhp had 570bhp in qualifying & there were claims of 600bhp in testing.When the RS500's came to an end in the touring car championship, I read an interview with, IIRC, Andy Rouse, who said they were pushing 600bhp back then and going through a clinder block per race.
What has changed in the years since to allow people to run so much more power without such frequent rebuilds?
The block is the weak link it warps. Today we have Nikasil liners, multi-layer gaskets, improved oil distribution & some many mods done to the block that are secret at this time proved by development. Even today 900bhp is proving difficult which is why we have stopped at 850bhp. The block will also crack around the crank bearings if Power is pushed beyond 900bhp. We cracked a block with a 700bhp engine & a massive 200+ shot of Nitrous.
MADRod said:
They were racing with 540bhp had 570bhp in qualifying & there were claims of 600bhp in testing.
The block is the weak link it warps. Today we have Nikasil liners, multi-layer gaskets, improved oil distribution & some many mods done to the block that are secret at this time proved by development. Even today 900bhp is proving difficult which is why we have stopped at 850bhp. The block will also crack around the crank bearings if Power is pushed beyond 900bhp. We cracked a block with a 700bhp engine & a massive 200+ shot of Nitrous.
Good threadThe block is the weak link it warps. Today we have Nikasil liners, multi-layer gaskets, improved oil distribution & some many mods done to the block that are secret at this time proved by development. Even today 900bhp is proving difficult which is why we have stopped at 850bhp. The block will also crack around the crank bearings if Power is pushed beyond 900bhp. We cracked a block with a 700bhp engine & a massive 200+ shot of Nitrous.
MADRod said:
They were racing with 540bhp had 570bhp in qualifying & there were claims of 600bhp in testing.
The block is the weak link it warps. Today we have Nikasil liners, multi-layer gaskets, improved oil distribution & some many mods done to the block that are secret at this time proved by development. Even today 900bhp is proving difficult which is why we have stopped at 850bhp. The block will also crack around the crank bearings if Power is pushed beyond 900bhp. We cracked a block with a 700bhp engine & a massive 200+ shot of Nitrous.
RodThe block is the weak link it warps. Today we have Nikasil liners, multi-layer gaskets, improved oil distribution & some many mods done to the block that are secret at this time proved by development. Even today 900bhp is proving difficult which is why we have stopped at 850bhp. The block will also crack around the crank bearings if Power is pushed beyond 900bhp. We cracked a block with a 700bhp engine & a massive 200+ shot of Nitrous.
Good info. Nikasil liners, are they inserted into the block or a coating of the parent metal bore?
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