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Engine upgrade options.
DANMAN - 29/3/14 at 01:14 AM

Hi guys.

I am thinking of upgrading the engine in the Stuart Taylor, I was going to turbo or supercharge it but by the time I spend that sort of cash it would be cheaper to go with a new engine which I think would be more reliable and I can sell the old one to recoup some cash. It currently has a CBR900RR engine in it. I would like to go with another light engine if possible and due to regulations in Oz it can be a maximum of 10% larger in capacity than the one currently fitted so this I guess means the following engine options:

1) CBR1000
2) ZX10
3) R1
4) GSXR1000

Does anyone know where I can find the weights for these engines? Also what are the pro's and cons of each for gearbox and general reliability? Will be looking at options from around 2008 onwards.

sam919 - 29/3/14 at 09:26 AM

The CBR1000 is the engine of choice, light, bhp figures are accurate and reliable. A quick chat to AB at AB Performance and he'll sort you out with one as well as give you all the info you need, they can run with bike ECU with some mods...buzaz box, and need a billet sump if your pressing on. Anyway he'll tell you everything.

It's the choice I have made, over the R1 which is another good choice no need for ds and good power just a few bhp less which is negligible for road use

There is a thread in BEC that was started ' bike engine weights' I think, there's info in there for most of these engines

sam919 - 29/3/14 at 09:28 AM

http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=187997

Hellfire - 29/3/14 at 06:52 PM

IMO you're not going to get a hugely noticeable difference from swapping out a CBR900RR for any of those in your list. I reckon your money would be better spent adding lightness to your ST.

Phil

DANMAN - 29/3/14 at 11:59 PM

The 08 CBR1000 looks good at only 62.5kgs and around 180HP from what I have read. The other engine I was thinking of was the 2011 ZX10R which is apparently 200HP although I'm not sure how much truth there is in that and how fragile the gearbox might be.

DANMAN - 30/3/14 at 12:08 AM

quote:
Originally posted by Hellfire
IMO you're not going to get a hugely noticeable difference from swapping out a CBR900RR for any of those in your list. I reckon your money would be better spent adding lightness to your ST.

Phil


I have it down to around 440kgs so far. I figure with the current engine the power to weight ratio is around 306HP/Tonne, with the CBR1000 engine weight would probably creep up to 455kgs (surge tank, extra fuel pump, etc) but the power to weight ratio would be up to around 395HP/Tonne. I think with a decent exhaust, air cleaner and ECU upgrade / tune power would get up around 190-200HP so the ratio would be around 417 - 439. That seems like a pretty hefty difference?

sam919 - 30/3/14 at 08:02 AM

With a full blown tune you'll get some good figures:

http://www.fwdevelopments.com/service.cfm?product=13&id=15&cat=1

Have a chat the ab as even with ex, ECU etc you'll still be around 180ish with a good engine. Taking it further the price rockets into thousands. He has dyno'd these engines to the death as this is what he used in his sabre, but he knows them very well non of the bullsh*t you read online.

I don't think you'll be disappointed :-)