Power / torque predictions?
#137
We're going to get some Timeserts made up and also have a custom thread tool thingy made. I spoke to someone here about the Keenserts but he wasn't so keen on them. They sell a product called Bigsert but they aren't Big enough for these studs. (End of word association puns now).
#138
Three Wheelin'
I would recommend using roll-tap when threading the block for timeserts, not regular cutting tap. Roll tap makes much stronger thread by not cutting the aluminium but rather displacing it and making it more dense.
When I twin-plugged my 911 cylinder heads (total of 12 of them) I ordered M12x1.5 roll tap (used 12mm plugs as secondaries like Porsche factory did back in RSR days to leave more material in the head). It needs special drill too (for M12 it was 11.8mm iirc).
Also, 911 guys usually prefer Casesavers over Timeserts as these have more coarse thread (2mm pitch) on the outside to stick good in the magnesium case. These are pretty straight forward to have custom made, just pick proper material.
When I twin-plugged my 911 cylinder heads (total of 12 of them) I ordered M12x1.5 roll tap (used 12mm plugs as secondaries like Porsche factory did back in RSR days to leave more material in the head). It needs special drill too (for M12 it was 11.8mm iirc).
Also, 911 guys usually prefer Casesavers over Timeserts as these have more coarse thread (2mm pitch) on the outside to stick good in the magnesium case. These are pretty straight forward to have custom made, just pick proper material.
#139
Rennlist Member
Thread Starter
Thanks for good information guys.
#140
Rennlist Member
#141
Rennlist Member
Thread Starter
Trying to establish if there's enough meat to use .75" x 10tpi Timeserts.
#142
Addict
Rennlist Member
Rennlist Member
This was my block before timeserting, it looks like there is enough meat since the shop that did it had to make a custom beefier 'timesert' piece for this hole.
Normal hole:
Wunderbar hole:
Normal hole:
Wunderbar hole:
#144
Addict
Rennlist Member
Rennlist Member
Tube is there for a reason. Because of this tube you don't need torque plate for machining cylinders.
But could be shortened a bit I guess.
But could be shortened a bit I guess.
#145
Drifting
#146
Addict
Rennlist Member
Rennlist Member
How do they set the bore diameter if the block is heated?
Torque plate is needed where threads start at the deck surface or in line with cylinder walls because when the bolts are torqued they pull the material and deform cylinders.
In this case, threads are under cylinders and do not deform them when torqued. Thats why factory procedure doesn't involve torque plate.
Torque plate is needed where threads start at the deck surface or in line with cylinder walls because when the bolts are torqued they pull the material and deform cylinders.
In this case, threads are under cylinders and do not deform them when torqued. Thats why factory procedure doesn't involve torque plate.
#148
Addict
Rennlist Member
Rennlist Member
I tried to put room temperature pistons in ~ 10c block and the pistons didnt fit. I really wonder how this hot machining method works.
#149
Rennlist Member
Thread Starter
We want to go to 19mm. Looks like there is enough room around it to give it a try by referring to another block.