JonnyAlpha
Member
- Messages
- 692
Hi,
I have started to have a go at modifying (increasing the chamber size and modifying shape) of an A Series (Classic Mini) Cylinder Head and was looking for anyone on here that could share some pearls of wisdom regarding valve seat cutting.
I picked up a second hand set of Neway Valve Seat Cutters and am now in the process of confirming exactly what I need to achieve what I am after.
The valve seats are for valve sizes 35.6mm Inlet and 29.2mm Exhaust, angles are 45 degree with a 30 degree top cut and 60 degree bottom cut.
The Neway set I picked up has three cutters in it and I have hopefully found the newer versions of these on the Neway site and have linked them.
One of the cutters is a Neway 285 and looks to be the correct size for the Inlet (Just had a quick play on an inlet) but is slightly to big for the exhaust as it fouled on the chamber side - although this may be OK if I moved the blades in a little and this was on an unmodified chamber, which may have a little wiggle room when I expand it?
The other two cutters are marked 110 and 275:
Neway 110:
Neway 275:
I maybe able to sell the Neway 110 and 275.
I have modified one chamber on a test head and have increased the size by raising the chamber roof and enlarging the chamber walls. I now need to re-cut the inlet and exhaust seats so that I can seal the valves and measure the chamber size.
I also need to source some cutters to do the 30 and 60 degree cuts, based on the valve sizes and limited room between the valve seat and the chambers walls believe the cutters I would need to go with the one I have are:
CU602
CU114
Or I buy two new cutters that would do both the inlet and the exhaust and all three angles:
CU230
CU270
So some questions:
Can I cut valve seats from scratch with a Neway hand cutter?
When cutting valve sets should I use some cutting fluid of any sort?
Many thanks
I have started to have a go at modifying (increasing the chamber size and modifying shape) of an A Series (Classic Mini) Cylinder Head and was looking for anyone on here that could share some pearls of wisdom regarding valve seat cutting.
I picked up a second hand set of Neway Valve Seat Cutters and am now in the process of confirming exactly what I need to achieve what I am after.
The valve seats are for valve sizes 35.6mm Inlet and 29.2mm Exhaust, angles are 45 degree with a 30 degree top cut and 60 degree bottom cut.
The Neway set I picked up has three cutters in it and I have hopefully found the newer versions of these on the Neway site and have linked them.
One of the cutters is a Neway 285 and looks to be the correct size for the Inlet (Just had a quick play on an inlet) but is slightly to big for the exhaust as it fouled on the chamber side - although this may be OK if I moved the blades in a little and this was on an unmodified chamber, which may have a little wiggle room when I expand it?
The other two cutters are marked 110 and 275:
Neway 110:
Neway 275:
I maybe able to sell the Neway 110 and 275.
I have modified one chamber on a test head and have increased the size by raising the chamber roof and enlarging the chamber walls. I now need to re-cut the inlet and exhaust seats so that I can seal the valves and measure the chamber size.
I also need to source some cutters to do the 30 and 60 degree cuts, based on the valve sizes and limited room between the valve seat and the chambers walls believe the cutters I would need to go with the one I have are:
CU602
CU114
Or I buy two new cutters that would do both the inlet and the exhaust and all three angles:
CU230
CU270
So some questions:
Can I cut valve seats from scratch with a Neway hand cutter?
When cutting valve sets should I use some cutting fluid of any sort?
Many thanks