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In Reply to: RE: I couldn't agree more.. posted by Craiger56 on June 27, 2015 at 16:43:17
The Honda S-2000 was, believe it or not, a STROKER. Bore was slightly less than stroke.
I have NO idea how to get 9k out of a 5 main bearing 4 banger. I think it had a balance shaft?
On a WOW NOTE! Ford is making a NEW V-8 for the 'Stang. It uses a SINGLE PLANE crank which allows revs to OVER 8000 redline. It is a MONSTER motor and might force GM's hand.
All American V-8s use a 2-plane crank which is good to maybe 6500 or so tops.
Too much is never enough
Follow Ups:
The Triumph's 92mm stroke is only slightly longer than the Honda's so that by itself is not a good argument for rpm capability. My bad.
Balance shafts are used to minimize vibration, or to make in-line four's feel like in-line sixes, but are also parasitic, rotating at twice crank speed.
The Honda's excellent 5-main fully counter-weighted crank allows (doesn't break) high rpm's, while the advanced cylinder head and valve train enables (good breathing/ no valve float) high rpm's.
More on flat-plane cranks linked
Bore and stroke = 87 mm (3.4 in) by 84 mm (3.3 in). Overbore.
Honda got it to redline at 9K by using 4 valves per cylinder and VTEC camshaft technology. VTEC engages around 5800 rpms.
The F22C1 engine (2.2 liters) was stroked. Bore & stroke = 87 mm (3.4 in)
by 90.7 mm (3.57 in). Redline at 8K.
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