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Message: <blockquote data-quote="PAIPON" data-source="post: 763445" data-attributes="member: 2479">my friends & i just done a 4G15 mod project on a 1999 efi 1.5wira. results quite impressive but we don't do any dynotest yet....FYI, Head upgrades not give much different on total power output of 4G15. Anyhow theres no other alternative to fit a DOHC head to this 4G15. Refer to our mod project, concentrate on rework of stock 4G15 head, piston, cylinder bore, cam, flywheel & clutch.1. dismantle engine 100%2. dismantle head 100%3. Port & polish head..110%4. change cam to matspeed cam...i'm not remember which type but it was a daily driving type (bought 2nd hand)5. dismantle stock piston from the connecting rod.6. Change piston from stock to 1.6 (sohc) refit with stock 4G15 connecting rod. Be sure to fit the piston with all new piston rings.7. Rebore block until the 1.6 piston fit....(let it done by engineering shop..they know it well)8. get a mitsubishi flywheel, i'm not sure which type but it can be fitted with 1.6 clutch set.send to engineering shop...lighten it a-bit only...9. Get new "Overhaul gasket set" to replace all old gasket when reinstall the engine.10. Get new sets of crankshaft bearing + conrod bearing 11. Get new 1.6 radiator (thick type)....RM250 only (without fan)...in kemaman laa...Results:1. The engine seems to be injected with steroid, very fast respond & takeoff also good in long distance run. No need to compare with 4G91, coz it can easily play with stock 1.6 satria! Journey from kemaman to KL and back to kemaman was a very fun driving experience on this reworked 4G15. Don't know how to explain but...believe me... satisfaction guaranteed!!2. Engine temp will be in normal behaviour if 1.6 radiator installed. Cooling fan also not in stress...if use Stock radiator, the cooling fan will frequent spinning (not permanently spinning laaa)...however the temp was not even touch mid section of temp meter, don't worry!3. From our studies, No worries to whack the engine coz, timing belt was short and less load to spin with, one top pulley, one bottom pulley, tensioner bearing that's it! ...compared to DOHC which much more load (two top pulley, longer belt...) to operate and high tendency of slacking or damaging the belt....4G15 timing belt ori: RM150 complete set! damn cheap maaa....</blockquote>

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