help with 4g64/63 timing marks
Jan 17, 2011, 01:38 AM
#1
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help with 4g64/63 timing marks
got my evo tuned recently but it was low on power. it put down 450hp on the vdr....i wanted to see peoples opinions on my setup to see if i can improve it at all
mods:
built 2.4l 4g64/63
stock head
bc272s w bc springs
stock i/manifold
ported ex/manifold
fp black
2 1/2"cooler piping and ebay cooler
work 02 w 3"exhaust straight through no cat
fpr surge tank w 044
fic 1450s
we are leaning towards the cam timing being wrong so tell me what u think of the marks....these pics are with the crank at tdc.....i was thinkin i should get 4g64 dohc stock cam gears and a 4g64 timing belt and have it at 0,0...but im not sure i should
note; these are fidanza gears and the camshaft dowl is in the hole NOT marked evo. my mech put it that way so the degree markings line up to the rocker cover marks
thanx
mods:
built 2.4l 4g64/63
stock head
bc272s w bc springs
stock i/manifold
ported ex/manifold
fp black
2 1/2"cooler piping and ebay cooler
work 02 w 3"exhaust straight through no cat
fpr surge tank w 044
fic 1450s
we are leaning towards the cam timing being wrong so tell me what u think of the marks....these pics are with the crank at tdc.....i was thinkin i should get 4g64 dohc stock cam gears and a 4g64 timing belt and have it at 0,0...but im not sure i should
note; these are fidanza gears and the camshaft dowl is in the hole NOT marked evo. my mech put it that way so the degree markings line up to the rocker cover marks
thanx
Last edited by evoyrrah; Jan 17, 2011 at 01:46 AM.
Jan 18, 2011, 06:01 PM
#5
Looks like exhaust is 3 CA late and intake is 4 CA early. So now you have 7 degrees more of overlap and both expansion and compression strokes are shorter.
But it really depends on the cams and where the ex valves open and intake valves close (i.e., 48 BBDC and 46 ABDC respectively), thats the info I would need to find optimal timing.
But it really depends on the cams and where the ex valves open and intake valves close (i.e., 48 BBDC and 46 ABDC respectively), thats the info I would need to find optimal timing.
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Jan 18, 2011, 08:54 PM
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I hope you find the answer you are looking for so I can copy you mate 
getting slightly worried about what settings we should be using. 
I think I am going to degree my cams to make sure they are spot on.
getting slightly worried about what settings we should be using. I think I am going to degree my cams to make sure they are spot on.
Jan 18, 2011, 10:20 PM
#12
not sure what all the confusion here is about? this is a non mivec motor, adjusting these cam gears is cake!!
basically line up the bottom end to TDC, the actual marks on the cam gears is going to be off, what you are doing with the degree markings on the gears is just moving the TDC marks to the valve cover marks, so essentially your new cam gear TDC marks is the inner marking on the movable inner park of the cam gear, move that to align to the valve cover markings regardless of where the outer gear markings are.
your intake cam gear should be spot on, and your exhaust gear is the one that will need adjusting.
basically line up the bottom end to TDC, the actual marks on the cam gears is going to be off, what you are doing with the degree markings on the gears is just moving the TDC marks to the valve cover marks, so essentially your new cam gear TDC marks is the inner marking on the movable inner park of the cam gear, move that to align to the valve cover markings regardless of where the outer gear markings are.
your intake cam gear should be spot on, and your exhaust gear is the one that will need adjusting.
Jan 19, 2011, 12:01 AM
#14
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not sure what all the confusion here is about? this is a non mivec motor, adjusting these cam gears is cake!!
basically line up the bottom end to TDC, the actual marks on the cam gears is going to be off, what you are doing with the degree markings on the gears is just moving the TDC marks to the valve cover marks, so essentially your new cam gear TDC marks is the inner marking on the movable inner park of the cam gear, move that to align to the valve cover markings regardless of where the outer gear markings are.
your intake cam gear should be spot on, and your exhaust gear is the one that will need adjusting.
basically line up the bottom end to TDC, the actual marks on the cam gears is going to be off, what you are doing with the degree markings on the gears is just moving the TDC marks to the valve cover marks, so essentially your new cam gear TDC marks is the inner marking on the movable inner park of the cam gear, move that to align to the valve cover markings regardless of where the outer gear markings are.
your intake cam gear should be spot on, and your exhaust gear is the one that will need adjusting.
