Valve reliefs on 951 pistons for 16v head (photos)
07-06-2018, 10:20 PM
#46
Race Car
A few people asked for pics,
These would go right into 100.5mm finished bore with the required .07mm clearance.
4 x each, alusil, steel liner or nikasil compatible ring sets, pistons, pins.
Valve reliefs spec'ed for use of 39mm 968 intake valves but are compatible for 37mm S/S2 valve, exhausts are 33mm.
T
These would go right into 100.5mm finished bore with the required .07mm clearance.
4 x each, alusil, steel liner or nikasil compatible ring sets, pistons, pins.
Valve reliefs spec'ed for use of 39mm 968 intake valves but are compatible for 37mm S/S2 valve, exhausts are 33mm.
T
07-07-2018, 04:29 AM
#48
I am planning on dropping an S head on my 951 block..have head (needs to be rebuilt/prepped), S exhaust flange and cut down S intake manifold.
Have not sourced pistons yet, and was considering just notching existing pistons.... How killer of a deal are you thinking on your set?
malcolm
Have not sourced pistons yet, and was considering just notching existing pistons.... How killer of a deal are you thinking on your set?
malcolm
07-08-2018, 09:48 PM
#49
Race Car
I’m in process of building a 2.5 16 valve turbo motor and have both S and 951 pistons not sure which way to go take a 1mm off the outer crown 360 deg on s units or cut valve reliefs in 951 unit. The S piston is a tiny bit lighter so thinking of getting them cut then swain coat and put them back in there holes they came from? What’s the feedback like on the 951 pistons running?
T
07-08-2018, 09:57 PM
#50
Race Car
Additional features,
Accumulator Groove V-shaped groove machined in the 2nd ring land that adds to the volume between the top and second ring. This groove accumulates residual gasses from combustion which alleviates top ring flutter and premature second ring wear, improving ring seal.
Anti Detonation Grooves (Contact Reduction Grooves) Also know as contact reduction grooves, which limit the piston/cylinder contact during high temperature and high RPM. These grooves also protect the top ring by disrupting detonation waves.
Broaches Broaches are horizontal slots in the pinbore designed to allow oil to enter between the wristpin and pinbore. Broaches are also used to accommodate the wristpin shape under compression, as it can become somewhat oval and needs room in order to alleviate galling.
Guys, I'm giving these away at less than half price.
Paid $1136.00
1st $500 takes them (+shipping).
The piston + pin is lighter than stock 944S cast KS pistons + pin.
T
Accumulator Groove V-shaped groove machined in the 2nd ring land that adds to the volume between the top and second ring. This groove accumulates residual gasses from combustion which alleviates top ring flutter and premature second ring wear, improving ring seal.
Anti Detonation Grooves (Contact Reduction Grooves) Also know as contact reduction grooves, which limit the piston/cylinder contact during high temperature and high RPM. These grooves also protect the top ring by disrupting detonation waves.
Broaches Broaches are horizontal slots in the pinbore designed to allow oil to enter between the wristpin and pinbore. Broaches are also used to accommodate the wristpin shape under compression, as it can become somewhat oval and needs room in order to alleviate galling.
Guys, I'm giving these away at less than half price.
Paid $1136.00
1st $500 takes them (+shipping).
The piston + pin is lighter than stock 944S cast KS pistons + pin.
T
