Guess on piston specs (picture)
05-04-2009, 03:09 PM
#1
Launching!
Thread Starter
iTrader: (12)
Join Date: Apr 2009
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
Guess on piston specs (picture) Anybody want to venture a guess on what the dish is on these pistons. There Diamond and probably all custom not sure though. With 243 heads 4.070 bore and a 4" stroke supposedly making 11:1 compression.
Thanks
Thanks
05-04-2009, 04:16 PM
#3
Launching!
Thread Starter
iTrader: (12)
Join Date: Apr 2009
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
Thanks it's got quite a dish it may be hard to tell in the picture but you can see the line where it starts on the outer edge of the piston. I was thinking a flap top with 64cc heads would be higher compression.
05-04-2009, 05:29 PM
#4
Launching!
Thread Starter
iTrader: (12)
Join Date: Apr 2009
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
Here's some picture of the heads they are milled GTP Stage III 243's so the CC may not be 64 still they don't look to big any guess. I'm hoping that 72cc heads will get my compression way down.
05-05-2009, 10:24 AM
#7
Launching!
Thread Starter
iTrader: (12)
Join Date: Apr 2009
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
Used a medical surenge and some plexiglass and with some margin of error got about 60cc out the heads pretty confident with that number it may even be 59cc which is possible I gues but these are 243 heads.
The pistons were kinda of tricky I put it in TDC and put the plexiglass over the piston seeling it at the lip where the dip starts with some greese. I started filling in the hole I made and it first it just all leaked through the greese so I had to hold pressure on the seal to stop the leaked. I would say the I was 90% full when I had to stop due to liquid seeping out of the whole I made to let air out. At that point I was 20cc in figure 20% seeped out or into the grease gives me about a 15cc dish. Also I figured some was leaking through the valve clearance cuts.
My questions are now
1.) Is it possible my 243 heads have 59cc combustion chambers.
2.) Piston deck clearance what is a good number to use for this. At TDC my pistons don't become flush but you can only tell barely by running your finger and close examination.
The pistons were kinda of tricky I put it in TDC and put the plexiglass over the piston seeling it at the lip where the dip starts with some greese. I started filling in the hole I made and it first it just all leaked through the greese so I had to hold pressure on the seal to stop the leaked. I would say the I was 90% full when I had to stop due to liquid seeping out of the whole I made to let air out. At that point I was 20cc in figure 20% seeped out or into the grease gives me about a 15cc dish. Also I figured some was leaking through the valve clearance cuts.
My questions are now
1.) Is it possible my 243 heads have 59cc combustion chambers.
2.) Piston deck clearance what is a good number to use for this. At TDC my pistons don't become flush but you can only tell barely by running your finger and close examination.
Trending Topics
05-09-2009, 11:37 AM
#9
Launching!
Thread Starter
iTrader: (12)
Join Date: Apr 2009
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
Turns out there -19cc Diamond piston and the heads are milled to have 53cc combustion chambers giving an 11.0:1 compression with .052 gaskets and an assumed stock deck height which hasn't been confirmed yet. Had no idea those heads were milled that much.
I've got Patriot LQ9's and a cam on the way and the procharger should be ordered this week. Got the compression a little lower than I expected.
I'm getting the 243 GTP head's flowed this week and they should be up for sale after that along with the cam, lifters and pushrods.
I've got Patriot LQ9's and a cam on the way and the procharger should be ordered this week. Got the compression a little lower than I expected.
I'm getting the 243 GTP head's flowed this week and they should be up for sale after that along with the cam, lifters and pushrods.
05-09-2009, 01:52 PM
#11
Launching!
Thread Starter
iTrader: (12)
Join Date: Apr 2009
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
I was able to speak with the guy who built the engine this morning and he was recalling everything he could about the engine. He was certain on the heads and fairly positive about the pistons. I also did my rough CC'ing above and I assumed I just was having some major leakage but now I'm thinking I was more correct, I don't really have the equipment to do it properly but I'm taking the heads to a shop on Monday to do things properly.
The heads were all custom done by hand back in 05 or 06. I know they were first on a 373 and it spun a bearing and they put the diamond pistons on it with a 4" crank and thats why they went with -19 pistons to keep the compression down.
The heads were all custom done by hand back in 05 or 06. I know they were first on a 373 and it spun a bearing and they put the diamond pistons on it with a 4" crank and thats why they went with -19 pistons to keep the compression down.
