Can engine be blown and still have 175psi compression?

[McDog]

Cleaned up a 95 sn with ported 730cc 61x with a bpipe I just bought. New fuel lines, cleaned out gas tank and carbs. Ran it today and it did great right up until it sounded like a wounded elephant and was shooting a combo of air and water out of the bpipe pisser. :splatt:

It has dual cooling with 4 pissers coming off the head and one in front off the b-pipe. It still has 175psi compression and starts but will not run right and has no power. Where do I begin? Some help please?:dunno:

 

[SUPERTUNE]

Get to work and pull the head and do a visual inspection...

 

[Idok]

why does it have so many pissers?

 

[McDog]

Found a clamp that had busted where the bpipe connects to the hose going to the water box. The pipe was loose. Maybe that explains the air coming out the pisser there?
Could the loud squealing be a bearing burnt up somewhere?

 

[McDog]

I have no idea why it has so many pissers. The head was tapped in multiple places. I think it was set up by a racer but I don't know what for.

 

[Mike W]

You should only have 2 or 3 pissers at the most. If your getting steam out of a pisser your head gasket is blown. It will run like crap as well.

 

[McDog]

Won't it lose compression if the head gasket is blown?

 

[WFO Speedracer]

Actually it might raise compression if enough water gets in there.:wiggle:

 

[McDog]

All right I pulled the head. The gasket seems fine...no obvious blowout. Everything seems normal to my untrained eyes. Any more ideas,things to check, measure, etc.?at:

You can see the 4 pissers coming off the head.

Can anyone tell what kind of porting this is?

 

[McDog]

More pics

 

[SXR-FOREVER]

You should only have 2 or 3 pissers at the most. If your getting steam out of a pisser your head gasket is blown. It will run like crap as well.

I get steam out of mine on starts and when I turn off the motor? Can't tell when the water is shooting out. Motor runs great. Or did you mean ONLY steam?

 

[McDog]

I meant that instead of a steady stream of water when the motor was up and running, it was about 1/2 air and 1/2 water coming out of the outlet at the end of the b-pipe. The outlets from the head were all water. The inflow comes into the exhaust manifold and another comes into the head of the pipe.

Maybe its a pump problem. I'm going to pull it today.

 

[WFO Speedracer]

What you are describing is a solid indicator that the head gasket failed,clean the surfaces and install a new gasket and go ride.:brap:

 

[McDog]

Even the loud screaming noise?

 

[WFO Speedracer]

I have no idea about the loud screaming noise but the air and water spurting out of the pisser screams blown head gasket.

 

[SUPERTUNE]

But, If you are running 4 water outlets (pissers) and the pisser that's on the water line "T" ed to the stinger...there's probably not enough water pressure to keep the exhaust stinger pressure to back wash back to the "t"ed outlet pisser and cause it to have a 1/2 water/1/2 air spitter from that pisser. Just set the motor up to a normal/traditional dual cooling line setup to see if your problem is solved...
2 lines into the manifold in, with 2 lines out of head, one head outlet to the headpipe, out of headpipe to a 'T' fitting for the stinger and out to 1st pisser, 2nd line from head out, go out to 2nd pisser.

 

[Kaveman]

Found a clamp that had busted where the bpipe connects to the hose going to the water box. The pipe was loose. Maybe that explains the air coming out the pisser there?
Could the loud squealing be a bearing burnt up somewhere?

Could be that this is why it was running so poorly. When you pulled the hood were there exhaust gases present in the engine compartment? Could it be that the squealing was exhaust escaping between the pipe and hose like when you blow on the edge of a piece of plastic?

While you have the cylinder off, check the crank for smooth operation and the rods for excessive linear play.

 

[McDog]

OK I figured out why it had so many pissers. The guy who set up the boat was a racer. He had parallel cooling. Head pipe and exhaust were separate, that way he could have all the pissers he wanted off the head and not affect the pipe. One line into manifold, one line into b-pipe head. So that is why it still worked, but I still can't understand why he would have needed 4 pissers off the head.

I'm putting the engine back together now and I don't think there was anything wrong with it. I think the problem was a broken clamp on the b-pipe next to the stinger. It caused the weird trumpeting noise and let air mix in with the water at the pisser there.

 

[keefer]

A stuck bendix that keeps the starter engaged can cause a squealing noise fromt the starter bearings that are screaming as they fail from being spun to death. You might want to check that if the noise is still present.

 

[subnsxr]

besides the problems mentioned above it looks like you are detonating. check to see if you have pits on the exhaust side of the domes and piston tops. Is your gauge accurate? you may be running a high compression race boat on 92 octane. what gas are you running? My gauge was off and it cost me big bucks. it said 180 and actually I was at 205psi. get er'it checked.