O-ring'd 250 block
- Thread starter Does10s
- Start date
MandarinaRacing
Famous Member
and forged pistons.... 
major drool factor....
Alex
major drool factor....
Alex
kirkallen143
Famous Member
Does10s":3te5l00l said:All,
Here's a pic of Kelly's #1 piston with the block o-ringed.
Also note the both the 1/2" bolt holes and if you look real close you can see the cylinder sleeve "ring".
Later,
Will
Oh good God Will, you are going to make me take my head off again! Ha-ha. Sure is a looker.
Kirk
I'm just trying to do all that I can to keep the head gasket in place.
A good, dependable, 11 second (or 10's) street legal, Inline six is the goal. We can't do that if the head gasket is letting go after 17 passes.
I'm tired of pulling the head. Even though we made a cool tool so Kelly and I can lift the head, header, turbo, and downpipe all at once if we need to at the track so we can swap gaskets between rounds! It basically bolts to the valvetrain mounting bolt holes and is six feet long. Kelly stands on the outside of the drivers fender and I'm on the pass. side, and we just lift the head off. Works great! I'll have to take a pic of it!
Later,
Will
A good, dependable, 11 second (or 10's) street legal, Inline six is the goal. We can't do that if the head gasket is letting go after 17 passes.
I'm tired of pulling the head. Even though we made a cool tool so Kelly and I can lift the head, header, turbo, and downpipe all at once if we need to at the track so we can swap gaskets between rounds! It basically bolts to the valvetrain mounting bolt holes and is six feet long. Kelly stands on the outside of the drivers fender and I'm on the pass. side, and we just lift the head off. Works great! I'll have to take a pic of it!
Later,
Will
gravelrash
Well-known member
looks good Will.
gravelrash
Well-known member
did you have any trouble drilling and tapping for the 1/2" head bolts?
A
Anonymous
Guest
Will,
How much boost are you wanting to make?
I'm planning on making a lot of notes and taking a lot of pictures next weekend for my own use!
Later,
Doug
How much boost are you wanting to make?
I'm planning on making a lot of notes and taking a lot of pictures next weekend for my own use!
Later,
Doug
Doug,
I'd like to be able to go up to around 20lbs. but that's not the critical factor. Flow numbers are.
I'd much rather get 350hp at 10lbs. of boost then 350hp at 20lbs.
So once we get a cyl. head on this thing that'll flow, we'll be able to turn down the boost and go faster than we're going now.
And we'll never blow a gasket again!
See ya at Indy!
Will
I'd like to be able to go up to around 20lbs. but that's not the critical factor. Flow numbers are.
I'd much rather get 350hp at 10lbs. of boost then 350hp at 20lbs.
So once we get a cyl. head on this thing that'll flow, we'll be able to turn down the boost and go faster than we're going now.
And we'll never blow a gasket again!
See ya at Indy!
Will
gravelrash
Well-known member
Will,
Out of interest what compression ratio are you running?
Reason i ask is my pistons have a 28cc dish + 54cc combustion chamber + approx 1.5cc for 2 head gaskets and a decomp plate which is down around 7.3 -7.5:1 cr. I am about to take the decom plate out and keep with the one gasket.
Your piston dish seems nowhere near as deep as mine. What brand seems to be the best?
Cheers Greg
Out of interest what compression ratio are you running?
Reason i ask is my pistons have a 28cc dish + 54cc combustion chamber + approx 1.5cc for 2 head gaskets and a decomp plate which is down around 7.3 -7.5:1 cr. I am about to take the decom plate out and keep with the one gasket.
Your piston dish seems nowhere near as deep as mine. What brand seems to be the best?
Cheers Greg
Will,
I'm interested in the copper head gaskets you are using in your new build. Who made them and how long does it take to get them?
Can I assume that the O-ringed, composition gaskets gave you trouble?
I'm interested in the copper head gaskets you are using in your new build. Who made them and how long does it take to get them?
Can I assume that the O-ringed, composition gaskets gave you trouble?
A
Anonymous
Guest
gravelrash":23wqmweh said:
Looks like a stock dish.
My forged TRW's look just like them.
good to see the old 250 getting a work out i had a turboed 250 on lpg that ran 10.76 @126 but the car has gone 130mph here in australia a few years ago i ran 30psi in it all day everyday with a stock head gasket and never had a problem and i did over 100 passes never use a cooper one.
if you need any tips or help let me know.
check this link fullboost done a feature on it a while back
http://www.fullboost.com.au/feature_car ... Id=511&p=1
if you need any tips or help let me know.
check this link fullboost done a feature on it a while back
http://www.fullboost.com.au/feature_car ... Id=511&p=1
kirkallen143
Famous Member
drag-200stang":3touqifr said:
Mine (the composite) blew out after the third run at 15 psi on the turbo'd 200 six. And that was even with the fresh rebuild with a decked block and milled head. Now back with the Fel-pro and no problems at 10 psi on pump gas.
Kirk
Drag-200stang,
Yes the normal Corteco gasket never seemed to hold up. Now with that said I also couldn't get the Demon 500cfm carb to work correct either. (as you saw at Indy!) So the tune-up was the root cause for multiple head gasket failures.
So on went the copper gasket. It's made by a company in Cali.
http://www.headgasket.com is the website. Talk to Mordy.
He and I are finishing up the gasket design. He originally just digitized a Felpro gasket, set up his machine and sent us one. So I'm taking the oppurtunity to optimize the gasket for the maximum surface area for sealing. We're also working on making sure the bore centers are exactly right.
Last Friday night we took Kelly's Falcon to the track for some testing of the new equipment. That would include a Oz 250-2v head, a modified Oz intake manifold set up with a Holley 450cfm mech. secondaries carb and the .054" thick copper head gasket.
She only made one pass due to water in the oil. The head gasket was already seeping. Also the carb was acting funny. I believe we had a vacuum leak somewhere. The A/F ratio was all over the place at idle and at cruise. Never did figure it out.
But she ran a 12.81@106 at only 9lbs. of boost. So that cyl. head is a whole bunch better than the log head. According to our charting, it would've taken about 12lbs. of boost with the log head to get approx. the same ET/MPH.
We already have the motor tore down the head reinstalled. I cleaned the copper head gasket and the O-ring imprints look very good. Looks like it going to work fine. We trying "Yamabond" to seal up the water and oil passages in addition to the head gasket spray stuff.
We race again at FFW up in Phoenix in three weeks, so hopefully we'll have the new carb and gasket leakage sorted out by then.
But the Oz head is looking very promising....can't wait for the aluminum one!
Later,
Will
Yes the normal Corteco gasket never seemed to hold up. Now with that said I also couldn't get the Demon 500cfm carb to work correct either. (as you saw at Indy!) So the tune-up was the root cause for multiple head gasket failures.
So on went the copper gasket. It's made by a company in Cali.
http://www.headgasket.com is the website. Talk to Mordy.
He and I are finishing up the gasket design. He originally just digitized a Felpro gasket, set up his machine and sent us one. So I'm taking the oppurtunity to optimize the gasket for the maximum surface area for sealing. We're also working on making sure the bore centers are exactly right.
Last Friday night we took Kelly's Falcon to the track for some testing of the new equipment. That would include a Oz 250-2v head, a modified Oz intake manifold set up with a Holley 450cfm mech. secondaries carb and the .054" thick copper head gasket.
She only made one pass due to water in the oil. The head gasket was already seeping. Also the carb was acting funny. I believe we had a vacuum leak somewhere. The A/F ratio was all over the place at idle and at cruise. Never did figure it out.
But she ran a 12.81@106 at only 9lbs. of boost. So that cyl. head is a whole bunch better than the log head. According to our charting, it would've taken about 12lbs. of boost with the log head to get approx. the same ET/MPH.
We already have the motor tore down the head reinstalled. I cleaned the copper head gasket and the O-ring imprints look very good. Looks like it going to work fine. We trying "Yamabond" to seal up the water and oil passages in addition to the head gasket spray stuff.
We race again at FFW up in Phoenix in three weeks, so hopefully we'll have the new carb and gasket leakage sorted out by then.
But the Oz head is looking very promising....can't wait for the aluminum one!
Later,
Will
the link isnt working?
