I am starting on my NA project soon.
Original set up now:
1) Stock 1.4 DOHC 1398cc Chevy Aveo Engine with Ecotec II, twin cam 16 valves. (Bore 77.9mm X 73.4mm stroke) with UNICHIP Q+ piggyback computer
2) Walbro Fuel Pump
3) SARD Fuel Regulator set at 55 psi at idle
4) Light weight Crankshaft pulley
5) Ported and polished head with 2mm height shaved off for higher compression (compression ratio increased from 9.0 to 11.2 after shaved off 2mm with stock internal, tuned with UNICHIP)
I had the following list of stuffs:
1) My current set up as above.
2) 1599cc Lanos/Aveo Crankshaft. (81.5mm stroke, lanos/Aveo has 79.0mm bore)
3) 81.0mm oversize bore forged domed pistons with deep valve cuts for high compression (11.1:1 compression pistons for stock head unshaved) It comes with rings (duno which type), and pin (also duno which type flat or pressed and how they compare with stock one). With my shaved heads, the resultant compression will be higher than 11.1.
4) Forged H Beams con rods with ARP rod bolts balanced to plus minus 1 gram.
5) Carbon/Kelvar Clutch Kit which can withstand up to 350hp.
6) Lightweight billet steel flywheel abt 4.2Kg.
7) Cometic Head Gaskets default thickness.
regrinded lanos/Aveo 1.6 camshaft to 285 profile exhaust and intake cams with higher lifts than standard lanos/Aveo 1.6 camshaft. (stock 1.4 camshafts have abt 1.1mm lower lift than stock 1.6 camshafts)9) 11) ARP Flywheel bolts
10) strengthed head bolts
11) AEM cold air intake system
12)adjustable venier cams pulley
My questions are:
1) with the bigger stroke that I am having with the new 1.6 crankshaft compared to my 1.4 crankshaft, will the pistons pop out of the block at the tdc? Is it alright to pop out or do I need any block extension or shorter con rods to prevent this?
2) Whats the minimum clearence I need between the valves and pistons when they are at tdc?
3) Is lightening the crankshaft important? I see that the original 1.6 crankshaft looks quite bulky at the flaps and weighs 12-13 kg. Is it too heavy? Should I grind the flaps to be sharper so that it can redue some weight and cut through the oil sump with less drag?
4) Is the 1.4 crankshaft bearing the same as 1.6 crankshaft bearing? Do I need to change a set of bearing when I reassemble the engine? Or can use back the old one?
5) After shaved the head by 2mm, compression rised from stock 9.0 to 11.2 since 2mm is shaved off from the head with 73.4mm stroke. Now I add in this dome pistons which is 11.1:1 compression for stock head, what will be the new compression by calculation?
6) With the new compression and displacement, can I still drive to my Unichip tuner at low speed without damaging anything? How slow should I drive to prevent damage during this 10-15km ride to the tuner.
I have more questions to come. Hope the experts can share with me. I do wish to strip everything then discover I lack some parts.
