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Author: Subject: standard 1000cc vs 400cc turbo
retromods

posted on 14/7/11 at 09:30 PM Reply With Quote
standard 1000cc vs 400cc turbo

Hi

Someone at work has put this in my head so i'll have to ask as i cant decide (or know enough to make a decision!)

If you had a choice in sticking a standard setup CBR1000 engine in a kitcar or a standard CBR400 with a T2 turbo (homemade manifold, using carbs + standard ignition etc) which would be more fun? im guessing using low boost in a standard 400 engine might get around the same sorta figures as a standard 1000cc but dont know if the gearbox would take it for long. but would sound awesome

any thoughts?!

cheers

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mark chandler

posted on 14/7/11 at 10:07 PM Reply With Quote
It would not be my choice, the whole thing would lack grunt and be fragile.

Its easy sticking a turbo on an engine, you would need to manufacture a bespoke clutch to get near the power of a 1000cc lump, this will crucify the costs and as you have noted the gearbox would be a weak point.

Why not use the setup on a bigger engine, my blade engine is a £400 ebay special that makes 200bhp, the clutch alone doubled the purchase cost as another £400 without changing plates and steels...

So build with 1000cc, then add a turbo when funds allow.

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Paul TigerB6

posted on 14/7/11 at 10:11 PM Reply With Quote
CBR1000 every time. The clutch and probably gearbox of a turbo 400cc engine will last about 5 minutes in a BEC
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rf900rush

posted on 15/7/11 at 08:27 AM Reply With Quote
Why not just stick the turbo on the CBR1000

The not mauch advantage with a smaller bike engine.
I doubt a CBR400RR engine is much lighter than a late 1000cc engine.
The turbo'd 400 would have to tripple it's power to match a Late R1.

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franky

posted on 15/7/11 at 08:32 AM Reply With Quote
The v4's are bloody heavy little engines. The bikes weigh the same as modern 1000cc bikes.
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MikeRJ

posted on 15/7/11 at 12:51 PM Reply With Quote
You'd have to be running some properly serious boost to get an old CBR400 up to Fireblade power levels. The newest Blade make well over 3 times the power of the standard CBR400. It would self destruct in seconds without huge amounts of money being thrown at it, so a complete non-starter IMO.
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matt_gsxr

posted on 15/7/11 at 01:16 PM Reply With Quote
There is normally something like a x1.4 or x1.5 capacity handicap for turbo engines in sprints/hillclimbs

What this means is that your 400cc with turbo would be equivalent to a normally aspirated 600cc.

750cc with turbo versus litre-bike might be a fairer comparison.

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retromods

posted on 15/7/11 at 02:09 PM Reply With Quote
right o so i'll leave thoughts of 400cc to the side then was hoping they might fit a little better than a physically larger engine but if its not worth it then thats that
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