retromods
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posted on 14/7/11 at 09:30 PM |
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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
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posted on 14/7/11 at 10:07 PM |
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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
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posted on 14/7/11 at 10:11 PM |
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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
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posted on 15/7/11 at 08:27 AM |
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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
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posted on 15/7/11 at 08:32 AM |
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The v4's are bloody heavy little engines. The bikes weigh the same as modern 1000cc bikes.
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MikeRJ
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posted on 15/7/11 at 12:51 PM |
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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
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posted on 15/7/11 at 01:16 PM |
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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
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posted on 15/7/11 at 02:09 PM |
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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 ![](/images//smilies/bigsmile.gif)
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