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How hard does your EA81 rev and why.
Posted 14 November 2017 - 03:29 AM
Stock motor internals, stock intake manifold, stock exhaust, weber 32/36 with 140 / 155 mains, msd 4500v coil, race leads, iridium plugs, 2wd leone distributor. Advanced ignition timing till it pinged and then backed it off a bees wongleflute.
tach10.jpg 96.35K 7 downloads
Posted 14 November 2017 - 08:22 AM
Posted 14 November 2017 - 10:17 AM
I don't bother to wind mine out past the stock 5.5k redline. The turbo kicks in at 1,500 rpm and all the power is in the middle of the rev range anyway.
If you're shifting at 6,100 rpm, you're not shifting at the right rpm for acceleration.
Posted 15 November 2017 - 06:12 AM
Posted 15 November 2017 - 12:59 PM
Posted 16 November 2017 - 12:58 AM
Not very high in standard form (EA81)
Other reasons - 2 valves / cylinder single port intake and exhaust port heads / small shared manifolds (limitations to air flow increases for limited performance gains)
- similar for EA82s
- OHV limits high RPMs also
- Agree, 3 main bearing crank - bottom end not as strong for high rpms (EA82 similar)
IF serious about performance gains , EJ engines with 4 valves / per cylinder bigger manifolds, better for air flow increases / performance gains - especially ones with 4 port heads DOHCs, with freer revving OHCs, better for higher rpms.
Also 5 main bearings on crankshaft - bottom end stronger for higher rpms.
Wouldn't and didn't bother to try and modify my EA81 / 82s for those reasons.
The only one I would consider modifying is , if had an RX2 AWD 5MT D/R with EA82T would replace heads with 4 port heads / manifolds etc upgraded internals etc ,do it properly.
Power gains from 115hp (stock) up to 200hp
Also EA82 OHCs are more free revving so a better platform to start off with than clatterly old school OHV EA81s best left stock.
PS EA81s are mid rangers ie work best keeping motor spinning between 2500rpm and 3500rpm (ie max torque at 2400rpm max hp at 4800rpm
Nothing to be gained in exceeding 5000rpm just to prove a point apart from trying to destroy an engine .that isn't designed for high rpms.
Ea81s are bomb proof simplicity (gear driven cam) but over revving them is a sure way to try and kill them.
Edited by subnz, 17 November 2017 - 11:46 PM.
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