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For a year or so I've been thinking about a new engine for my car. Finally this project has advanced a little. Soon I've got a 1.9l block with 95.5mm pistons (by AE), new piston rings, bearings, etc. The bad thing is, somebody had cut a 0.75mm slice from a piston. Now the the slice has to be taken also from the block and all pistons will be made equally high to get the same compress ratio for every cylinder.
The head I'm first going to use is a 20S head (42mm/37mm valves), maybe slightly lowered for more compression. Intake manifold ported, and on it a Weber DGV 32/36. Injected CIH exhaust manifold and custom made downpipe (from manifold to the first muffler). Rest of the exhaust system is stock. Slightly lightened flywheel. Pertronix Ignitor.
I'd like the idle *not* to sound exactly like a rally/race engine... Car should also be nice to drive with lower rpm but still give a nice performance, and fair fuel economy and reliability.
What would be a good camshaft and compression ratio combination for this kind of engine?
Is a Enem Y12 (288 degrees, 11.1mm lift) with a 9.5 CR be a bad guess? Are there cheap and good alternatives for standard springs?
Are the standard jets for DGV enough?
I've got a set of older forged conrods with old 93mm pistons, but currently the 95.5mm pistons are with newer (cast) rods. Would it be worth of effort to change the conrods? Are the older ones also lighter?
What size head gasket I should use? Are gaskets with 95.5mm holes even available.
Lasse
The head I'm first going to use is a 20S head (42mm/37mm valves), maybe slightly lowered for more compression. Intake manifold ported, and on it a Weber DGV 32/36. Injected CIH exhaust manifold and custom made downpipe (from manifold to the first muffler). Rest of the exhaust system is stock. Slightly lightened flywheel. Pertronix Ignitor.
I'd like the idle *not* to sound exactly like a rally/race engine... Car should also be nice to drive with lower rpm but still give a nice performance, and fair fuel economy and reliability.
What would be a good camshaft and compression ratio combination for this kind of engine?
Is a Enem Y12 (288 degrees, 11.1mm lift) with a 9.5 CR be a bad guess? Are there cheap and good alternatives for standard springs?
Are the standard jets for DGV enough?
I've got a set of older forged conrods with old 93mm pistons, but currently the 95.5mm pistons are with newer (cast) rods. Would it be worth of effort to change the conrods? Are the older ones also lighter?
What size head gasket I should use? Are gaskets with 95.5mm holes even available.
Lasse