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revolution12345
30-06-15, 03:04 PM
Looking advice on best head to use. I have a 1600 bottom end with 1600 16v flat top pistons. Currenly running a 1600 Round Port head with a bit of porting. Its standard apart from that. I get valve lift at high revs and want to move to solid lifters and comp valve springs. But want to make sure I decide on the best head for the job. I have 1300 D Shape heads and SE Round ports. The 1300 has a smaller combustion chamber which should raise compression, but it might be overkill... Would a SE Round port be a better option?
Royston
30-06-15, 03:08 PM
Need to measure/burette everything and work it out.....

http://www.pngclub.com/forum/showthread.php?209643-OHC-8V-1300-to-1400-Engine-conversion-Looking-for-info
therealnovaboy
30-06-15, 03:40 PM
a standard cam will be fine with the comp ratio of a round port head and flat top pistons. However the Ideal CR is dependant on what cam you have and the dynamic CR which gets complicated. ID say anything up to 11:1 CR will be safe with a decent spec cam but might not be the best. I don't know what the d port heads CR will work out as but would guess it would be safe with a D port head, but again not necessarily any benefit.

its never a good idea to build engines on the based information a keyboard tuner has written on a forum. measure twice build once.

what cam are you using? if its wild enough running solid lifters the more the CR the better really.
revolution12345
30-06-15, 04:04 PM
What do people mean by waisted valve stems?
revolution12345
30-06-15, 04:05 PM
Im looking torque, not a high revving engine. Its for multivenues and lanes rallies which are very stop start and some reversing.
therealnovaboy
30-06-15, 07:54 PM
Im looking torque, not a high revving engine. Its for multivenues and lanes rallies which are very stop start and some reversing.

then you wont need solid lifters and a wild cam, and therefore much compression
therealnovaboy
30-06-15, 07:57 PM
What do people mean by waisted valve stems?

the waist of the valve is thinner than the stem so their is less restriction of air flow from the valve stem blocking the port. it also helps the air flow along the back of the valve and past the seat at low lift.
mowgli
03-07-15, 11:51 AM
the waist of the valve is thinner than the stem so their is less restriction of air flow from the valve stem blocking the port. it also helps the air flow along the back of the valve and past the seat at low lift.

but also be aware that the removal of metal will make them weaker too... there is thus more risk of a valve breaking