I am looking to heavily modify a D16A8 (=DOHC ZC)
I intend to raise the deck to get longer rods in with a D17 crank
I have done some homework on longer belts. Here are my notes after talking with Gates Tech Support.
Info I have to date is that a Gates:-
T142R is 124 teeth, 24mm wide HSN construction for DOHC D series & DOHC ZC
T132 is 126 teeth, 24mm wide Std construction
T247R is 126 teeth, 26mm wide HSN construction for B18C2
T895 is 126 teeth, 24mm wide HSN construction for H22A4, H22B and F22Z
After looking at my head, I measured the inlet side quench pads and they are down about 2mm. There is no exhaust side quench pad.
Also the round gasket face of the chamber is 74mm bore, so it overhangs the bore to give a 0.5mm quench all the way around.
Also the pistons are about 1mm down the bore, so after also including the gasket, there is a lot of clearance between the piston and the smallish quench areas.
Do you guys do anything to correct that, like 1mm longer rods or 1mm higher compression height pistons and about 2mm of the head or do you weld in extra quench pad on both sides.
I am considering making a deck plate from aluminium plate and using it to convert conventional wet sleeves to the equivalent of modular by using the deck plate which is accurately located by dowles to tie the sleeve to the block at the deck and ruining a D17 crank at 94.4mm stroke with longer than stock rods and with 28mm compression height pistons.
The belt should allow an extra 8mm of deck height and the 2mm milled off the head should allow another 2mm on the deck plate to keep the crank centre to cam centres at the std distance.
That gives 10mm higher deck and a good quench pad on the inlet side at least without welding.
So with deck up from 212 to 222mm and 28mm and 94.4 stroke I need 146.8mm long rods. That gives 1.56:1 rod to stroke which while short and turbo friendly is not to short where the rod gets laid over to much and has really high side loads on the block and piston.
I wonder what pin heights SRP or Wiseco offer in 78mm bore in pistons to suit boost.
Is 2mm (0.080") off the head OK. Has anyone done it.
Are the valve notches for DOHC different to SOHC D series . ie will flat top or even dish op pistons for SOHC D series work. At 0.080" off the head and about 0.036" piston to head, in an 1800 cc engine compression should not be a problem. I will do the sums accurately though.
Does anyone weld up the squish pads on the exhaust side to equal those on SOHC engines
I intend to raise the deck to get longer rods in with a D17 crank
I have done some homework on longer belts. Here are my notes after talking with Gates Tech Support.
Info I have to date is that a Gates:-
T142R is 124 teeth, 24mm wide HSN construction for DOHC D series & DOHC ZC
T132 is 126 teeth, 24mm wide Std construction
T247R is 126 teeth, 26mm wide HSN construction for B18C2
T895 is 126 teeth, 24mm wide HSN construction for H22A4, H22B and F22Z
After looking at my head, I measured the inlet side quench pads and they are down about 2mm. There is no exhaust side quench pad.
Also the round gasket face of the chamber is 74mm bore, so it overhangs the bore to give a 0.5mm quench all the way around.
Also the pistons are about 1mm down the bore, so after also including the gasket, there is a lot of clearance between the piston and the smallish quench areas.
Do you guys do anything to correct that, like 1mm longer rods or 1mm higher compression height pistons and about 2mm of the head or do you weld in extra quench pad on both sides.
I am considering making a deck plate from aluminium plate and using it to convert conventional wet sleeves to the equivalent of modular by using the deck plate which is accurately located by dowles to tie the sleeve to the block at the deck and ruining a D17 crank at 94.4mm stroke with longer than stock rods and with 28mm compression height pistons.
The belt should allow an extra 8mm of deck height and the 2mm milled off the head should allow another 2mm on the deck plate to keep the crank centre to cam centres at the std distance.
That gives 10mm higher deck and a good quench pad on the inlet side at least without welding.
So with deck up from 212 to 222mm and 28mm and 94.4 stroke I need 146.8mm long rods. That gives 1.56:1 rod to stroke which while short and turbo friendly is not to short where the rod gets laid over to much and has really high side loads on the block and piston.
I wonder what pin heights SRP or Wiseco offer in 78mm bore in pistons to suit boost.
Is 2mm (0.080") off the head OK. Has anyone done it.
Are the valve notches for DOHC different to SOHC D series . ie will flat top or even dish op pistons for SOHC D series work. At 0.080" off the head and about 0.036" piston to head, in an 1800 cc engine compression should not be a problem. I will do the sums accurately though.
Does anyone weld up the squish pads on the exhaust side to equal those on SOHC engines
