Re: JK's v6 book
Posted: Mon Jun 13, 2011 7:24 pm
Hi Z,
Pistons from CPS (Italy), JK rods, 37mm intake valves (in place of 35.6), ~11.5:1 CR, M3 cam profiles (11.3mm lift) with modified followers for mechanical operation. I'm not buying any expensive kits for this last one but I'll do my own mod, one that has worked perfectly so far in other hydraulic engines: disassemble the follower, tight fit a Teflon sleeve inside it, in the middle of which there's a short piece of 8mm valve stem. Under this I use std 8mm TS valve adjusting shims and these contact the 24v valve tips. Note that the shims are upside down but there's no issue there as required clearance is ~0.3mm. My only problem now is to find suitable valve springs as the std ones allow a max of 10.7mm safe lift (installed height -coil bind = 11.7mm minus at least 1~1.5mm for safety = ~10.5mm). Here's the biggest challenge though: I want to use the 164 3liter 24v block for all this! Therefore, to go 3.2, I am getting a 3.2 crank which at this point I don't know whether it fits into the old block! You see, I definitely want to use the old oil pump and sump arrangement. I remember when I first tried the JK rods in the 3liter, there were points where rod/block clearance was very tight. Therefore, I expect problems with the 3.2 crank. However, I am even prepared to cut holes in the block and reweld to make things fit! We'll see how it goes! I'll find someone around here with a loose crank and will borrow it for a trial first fit. I don't suppose anyone has tried this and can save me some time by answering the fit question?
Jim K.
Pistons from CPS (Italy), JK rods, 37mm intake valves (in place of 35.6), ~11.5:1 CR, M3 cam profiles (11.3mm lift) with modified followers for mechanical operation. I'm not buying any expensive kits for this last one but I'll do my own mod, one that has worked perfectly so far in other hydraulic engines: disassemble the follower, tight fit a Teflon sleeve inside it, in the middle of which there's a short piece of 8mm valve stem. Under this I use std 8mm TS valve adjusting shims and these contact the 24v valve tips. Note that the shims are upside down but there's no issue there as required clearance is ~0.3mm. My only problem now is to find suitable valve springs as the std ones allow a max of 10.7mm safe lift (installed height -coil bind = 11.7mm minus at least 1~1.5mm for safety = ~10.5mm). Here's the biggest challenge though: I want to use the 164 3liter 24v block for all this! Therefore, to go 3.2, I am getting a 3.2 crank which at this point I don't know whether it fits into the old block! You see, I definitely want to use the old oil pump and sump arrangement. I remember when I first tried the JK rods in the 3liter, there were points where rod/block clearance was very tight. Therefore, I expect problems with the 3.2 crank. However, I am even prepared to cut holes in the block and reweld to make things fit! We'll see how it goes! I'll find someone around here with a loose crank and will borrow it for a trial first fit. I don't suppose anyone has tried this and can save me some time by answering the fit question?
Jim K.