Re: Destroking a cbr600rr
Quote:
Originally Posted by
seacoastsport
Marine did the 3 cranks for R5 motors that we built last year. No issues, just bring your checkbook.
Also, no issues with longevity if assembled correctly with the proper parts as I stated above ;)
-ak
Adam, were all 3 for Grush?
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Quote:
Originally Posted by
tls25rs
Nice catch. I didn't notice that before.
Re: Destroking a cbr600rr
Quote:
Originally Posted by
sdog30
Nice catch. I didn't notice that before.
That isn't how I knew, I've seen the bikes at the shop and knew he had the R5. Was just a fun way to show it to you.
Re: Destroking a cbr600rr
Quote:
Originally Posted by
tls25rs
That isn't how I knew, I've seen the bikes at the shop and knew he had the R5. Was just a fun way to show it to you.
Its funny they are identical. With the angle of the two pictures, he literally could just have an R5 sticker on one side and an R6 on the other. Lol
Re: Destroking a cbr600rr
Quote:
Originally Posted by
sdog30
Its funny they are identical. With the angle of the two pictures, he literally could just have an R5 sticker on one side and an R6 on the other. Lol
Quote:
Originally Posted by
Kurlon
The R5 is a pretender in a GP class, yeah it's better than the SS/SB bikes that people bring, but it's nothing compared to what is actually legal. If someone brings a full on 250 the R5 will get smoked.
Mmmmmm rs250 yes pleaseeeee
Re: Destroking a cbr600rr
Not so sure any 250 you can actually buy would even hang with an R5. Numbers don't add up. Non factory type 250s make 80 HP. They are lighter, but in my experience, HP/wt is not a good way to compare performance. At the end of the straight, weight doesn't matter so much. Only HP.
Re: Destroking a cbr600rr
Quote:
Originally Posted by
Paul_E_D
Not so sure any 250 you can actually buy would even hang with an R5. Numbers don't add up. Non factory type 250s make 80 HP. They are lighter, but in my experience, HP/wt is not a good way to compare performance. At the end of the straight, weight doesn't matter so much. Only HP.
I mean if we are talking just Loudon... Straight isn't long enough to show that difference imo.
Re: Destroking a cbr600rr
But the R5 will have more torque as well.
Re: Destroking a cbr600rr
[QUOTE=sdog30;1516574]Adam, were all 3 for Grush?
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Yes, we did his two and the one in SammyG's for the 2017 season.
-ak
Re: Destroking a cbr600rr
[QUOTE=seacoastsport;1516647]
Quote:
Originally Posted by
sdog30
Adam, were all 3 for Grush?
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Yes, we did his two and the one in SammyG's for the 2017 season.
-ak
Ahhh, too be 20 and talented. Probably helps Scotty is his dad, too.
Sammy definitely earned that engine last year. He rode the hell out of that bike. Good thing you and I bumped when we did. :spit:
Re: Destroking a cbr600rr
Quote:
Originally Posted by
Paul_E_D
Not so sure any 250 you can actually buy would even hang with an R5. Numbers don't add up. Non factory type 250s make 80 HP. They are lighter, but in my experience, HP/wt is not a good way to compare performance. At the end of the straight, weight doesn't matter so much. Only HP.
2 strokes : HONDA RS 250R
They are still out there, and I and point you to a good source for info/parts in the north east. There's also been a bit of a resurgence in two stroke development by a few mfgs, turns out all those electronics that help dirty four strokes can do the same magic to smokers.
The other path would be to scoop up a Moto2 chassis now that they're switching base motors, it'd still have a street derived motor but it'd have more GP creds than an R5. :D
Re: Destroking a cbr600rr
Great video about modern LW vs. The old 250R
YouTube
Re: Destroking a cbr600rr
Quote:
Originally Posted by
Kurlon
2 strokes : HONDA RS 250R
They are still out there, and I and point you to a good source for info/parts in the north east. There's also been a bit of a resurgence in two stroke development by a few mfgs, turns out all those electronics that help dirty four strokes can do the same magic to smokers.
The other path would be to scoop up a Moto2 chassis now that they're switching base motors, it'd still have a street derived motor but it'd have more GP creds than an R5. :D
You do realize who you are arguing with, right? Lol
I like how you use a moto2 bike as a more viable and cost effective option over an R5. Lol
Re: Destroking a cbr600rr
Quote:
Originally Posted by
sdog30
You do realize who you are arguing with, right? Lol
I like how you use a moto2 bike as a more viable and cost effective option over an R5. Lol
Heh, never said it'd be more cost effective. :D I would be curious about total ready to race weight on a CCS GP legal Moto2 build vs an R6 / R5, that's the one thing I hate about my MW machine is it's such a pig to ride in comparison to my UL machine.
But, that goes back to the point that the GP classes aren't about controlling costs, they're geared for someone who wants to pull the pin on their credit rating and go bananas. Complaining that the R5 beats up on SS and SB built SVs is silly in that context.
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Re: Destroking a cbr600rr
Attachment 48609
Because i love 250 gp bikes :drink:
Re: Destroking a cbr600rr
Interested to see where this one goes :beer:
Re: Destroking a cbr600rr
Quote:
Originally Posted by
Kurlon
I thought Grush and the others went with billet cranks from Marine Crankshaft last season?
I have one of Grush's motors that I'll be riding in Daytona and Loudon this year and John told me he had the billet cranks in all 3 of his motors along with longer rods instead of decking the motor.
Re: Destroking a cbr600rr
Re: Destroking a cbr600rr
Quote:
Originally Posted by
Kurlon
That's a LOT of money!
I'm curious as to how much these destroked engines cost versus how much a "regular" stroke, 600 would cost...
Re: Destroking a cbr600rr
Quote:
Originally Posted by
number9
I'm curious as to how much these destroked engines cost versus how much a "regular" stroke, 600 would cost...
Primary cost adder is the crank, either spending to have one destroked or buying a billet one. Rods you'd be buying as part of a SB build to begin with so nothing new there, interesting that they're not playing with higher comp pistons?
Re: Destroking a cbr600rr
There's always the cheapest option of "destroking" it and hoping no one calls your bluff!
Found a couple 500 and RR stickers on ebay.
Boom, project completed for $12.99 shipped.
Sent from my SM-G920T using Tapatalk
Re: Destroking a cbr600rr
OK stupid question. How the heck do they inspect the engine internals to make sure the bike has been neutered I mean destroked when you show up at tech?
Re: Destroking a cbr600rr
Quote:
Originally Posted by
xxaarraa
OK stupid question. How the heck do they inspect the engine internals to make sure the bike has been neutered I mean destroked when you show up at tech?
So, for normal tech inspection, they don't. Normal tech is a safety inspection only and has nothing to do with class eligibility. After that, class legality is all on you to make sure you're actually legal until one of the following occurs:
1) Someone protests you. They put up cash (Amount determined by level of teardown required, see the rule book. In fact, read the whole thing.) and a written complaint spelling out which specific rule(s) are in violation. Your bike is then impounded and torn down far enough to verify the detail being protested. (Or some means of marking / sealing it is done to allow you to race for the rest of the day without tinkering / removing the cheat before the tear down that evening.
On a 565 claim that should be doable just by pulling the plugs and measuring stroke, there is also a tool that can measure the bore through a plug hole. If need be they can pull the head, etc. If you're found legal, the protestor forfeits the cash to the vindicated racer, with the idea that the cash covers labor/parts to put your machine back together, one time use gaskets, etc. If illegal... the protester keeps his deposit and we enter the penalty phase of the process.
2) You're lucky enough to win the random lottery of racers pulled after a race, you can see Johnny B waving those specific riders to tech as they pit in. This could be for a fuel test, quick airbox inspection, or it could be a case of scenario #3...
3) The Chief Referee decides he wants to look at your bike. He can pull you and inspect at whim without any protest being filed. LRRS started doing this more this year specifically because of all the hushed talk in dark corners claiming X/Y/Z had to be cheating 'cause obvious, right? I don't recall hearing of anyone being found illegal.