Trying to figure out if the head is warped or whether my fuel requirements need to be upped. I'm running around 200psi on my speedwerx big bore motor. The sleeves are level with the top of the cylinder and the old Speedwerx head that I had worked good but even straight avgas was pushing the limits of what that head was putting out. So I'm running the ADA head with 93 octane gas now and I blow an o-ring about every week or two. The domes were brand new when I got them but the shell was used. Any ideas what the problem could be?
Super Jet ADA head keeps blowing o-rings
- Thread starter Waternut
- Start date
- Location
- s florida
it's most likely your head shell. I had the same problem and it turned out that the dome started spinning and machined itself a bit into the head dome thus creating enough clearance to blow the o-ring after every ride
chriselmore_1
high on resin
- Location
- san jose ca
exactly why I'm not a fan of ada heads. I think the blowsion/umi/protec/kommander ect is a much better design. Check out the new kommander head!
cookn
Kamikaze
- Location
- where you live
I also agree with this. The dome needs to have that interference fit to give you that crush to seal up the oring
Freakrider
X247
- Location
- Tampa Bay area
Chucky @ XScream uses 1211 where the domes meet the head shell to slow down the wear caused by movement...he also torques the girdle studs to 38 ft/lbs....
I'll give the 1211 a go when I get my new o-rings. Holy crap on the girdle studs! I don't know if I'll go quite that far but maybe I'll try somewhere in the middle.
BruceSki
Formerly Motoman25
- Location
- Long Island
1211 isnt going to help you know. That head shell is worn.
Buy a new one before it wrecks your domes too.
Buy a new one before it wrecks your domes too.
- Location
- Hamilton Ontario
I have had the same problem, The Shell will squish over time and cause the o ring blowage... Before you spend loot on a new head, try putting thin shims in between the Dome and Shell. I have the smallest feeler gauge i could find cut up just to bring it out that little bit and have not blown a ring since.... knock on wood...
- Location
- baldwin ny
ada = crap good for 2 or 3 seasons then toss it. it will crack or ware out. shimming the dome COME ON!!
Humm....been using mine for 3 seasons now, about ~475 gallons of gas through it. No issues.
I've been running my ADA head for three seasons now and it was used when I got it. Originally it was on a 701 and now my bigbore stroker. I've never had an issue so far, I had that problem on an old westcoast head on a pos 550. Being an Ada dealer helps too.lol
- Location
- Hamilton Ontario
the shims have worked for me since November
- Location
- baldwin ny
humm i use that much gas in one season
- Location
- baldwin ny
pistons and a cylinder are much less money sorry i forgot that.
if you keep running a head that cant hold the dome in it
s the top of the cylinder up.