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Tony94S4

Rod to stroke ratio

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Hi does anyone have any info on the rod to stroke ratio on the 910 and V8 engine is it anywhere near 1.75

thanx

Tony

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Hi does anyone have any info on the rod to stroke ratio on the 910 and V8 engine is it anywhere near 1.75

thanx

Tony

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I


Marcus

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910 2.2 turbo: rod to stroke: 1.83 (5.5", 3.0" resp.)

920 2.0 turbo: rod to stroke: 2.0 (5.5", 2.724" resp.)

918 V8 rod to stroke: 1.74 (5.55" to 3.19" resp.)

Cheers!

Eric


77 Esprit S1

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Marcus

I'm trying to figure out if I do work to the head will the stock bottom  handle higher RPM, I thought if I upgrade the valve train I can rev higher but I find out I was wrong the block has a lot to do with it, with my honda engine on my CRX I put a CRV B20 engine (bad ratio close to 1.5-1) with SI B16 head (best honda engine ratio close to 1.75-1)  I and was revving it to 8500 rpm it didn't last to long now I'm about to build B20 Dart block with higher deck so I can have 2.0 liter with close to perfect stroke to rod ratio same time I want to do the head on the esprit S4.

If you don't know the ratio do you have the rod length center to center I think I have the formula somewhere to calculate the ratio and also do you know where I can get a hold of custom ground inlet cam shaft same duration but more lift

Thanks

Tony

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Tony,

IMHO you will not get any benefit from revving your turbo engine any higher than 6500rpm where max. power output is given (the redline is already at 7500rpm / 7000rpm for the V8) ... unless you modify the whole inlet outlet (valves - cams - ports - manifold - turbos ...)

From my experience with the Lotus 4-Cyl. and V8 the max. power rpm will not rise above 6500rpm unless you do excessive rework (cams, valves, portings ...)

Marcus


Marcus

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Tony,

IMHO you will not get any benefit from revving your turbo engine any higher than 6500rpm where max. power output is given (the redline is already at 7500rpm / 7000rpm for the V8) ... unless you modify the whole inlet outlet (valves - cams - ports - manifold - turbos ...)

From my experience with the Lotus 4-Cyl. and V8 the max. power rpm will not rise above 6500rpm unless you do excessive rework (cams, valves, portings ...)

Marcus

<{POST_SNAPBACK}>

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