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In Reply to: RE: I couldn't agree more.. posted by pictureguy on June 27, 2015 at 15:53:02
You're unearthing some good old memories now.
With two more main bearings, shorter stroke, and a fully counter-weighted crank, your Honda's engine was perfectly suited for the gearing it came with.
How many TR250's? I don't know, but a guy at my high school had a pristine one, while I was driving my four cylinder beater. It was my first understanding of the term 'social economic status'.
My girlfriend's brother had a Austin Healy 100-4 that had been brush painted with (green) house paint. It exhibited the same characteristics as your neighbor's MG.
Follow Ups:
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
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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