Can anyone figure this out ? Fresh motor driving me crazy

Ok this is weried, get my motor back from engine builder new rings,bearings,lifters and freshen heads, ok get blower back from blower shop they re stripped it, so I put blower and injection on and crank motor cranks rite up it running great for about 1 are 2 minutes everything looks good oil psi is 90 then I hear motor start to bog and lugs down slowly till it dies so I attempt to crank it back up and it won't turn over so I figure battery is almost dead so put charger on and it cranks up and runs about the same amount of time maybe 2 min then same thing lugs down till it dies so I attempt to crank and same thing starter just clicks like motor is locked up so I put ratchet in end of blower and it won't turn clockwise but will turn counterclockwise, then I try clockwise again and it turns. Hit starter and it cranks rite up runs about same amount of time maybe 2 min lugs and dies and same thing like motor is locked up so I didn't even turn motor just waited about a min hit starter and it cranked, same thing about 2 min lug and die just like motor locked up.. So I pulled valve covers all valves are dead on pulled oil filter and cut open it's clean oil is clean no metal are flakes are anything.. So I recorded it one time on my datta max and when I look at EGT they are all 700-750 at idel except #1 #7 #8 and they are all 190 -200.. This is all the same setup I been running all year just freshened motor and blower the engine builder has been building engines over 40 years and done 3 for me already that was flawless... Them 3 cylinders have to always been dead on with the rest.. What the crap has happen??? I blowed through all the lines checked those cylinders are firing, I'm just wondering even whith them cylinders dead it shouldn't lug motor like it's locking up...I'm puzzled .. It's a 540 brodix 380 heads a 1471 BDS Hi Helex with enderle big and ugly...

 

It will turn with a braker bar I actually was just out there had it running it ran good and smooth about 4 min then when it started to hunt alittle it stopped I took braker bar and turned it clock wise and it turned. I have took blower belt off turned motor from under car with flywheel tool and it turns smooth I pulled oil filter again and it's clean as a whisltle.. can't figure out why these 2 cylinders are cold ...hydro locked ??? Heard talk about is but what actually is happening if it done that ?

 

dead cylinders

what about a leakdown test, if only to eliminate that from the equation?

 

Mike that's kinda what I was thinking but really weirded that these 3 just all a sudden got that fat, everything is the same as it was when I pulled it off and it was all tapped up on the ends and boxed up while he had motor.. I really think as much as I've cranked and run it that if it was internal that there would be something in the filter by now.. It's gotta be fuel.. I guess I can move some nozzles around to kinda see if it changes... Wonder why it would have just got fat like that on 3 cylinders

 

I had my blower freshened this year got it back and it was so tight the starter could barely turn it over. Long breaker bar was no help. Thought it was something in the engine, turns out the blower was rebuilt too tight. Sent it back , fixed and no problems. On the first startup it was fine but it got progressively worse.

 

Mine was really really tight when I got it back but now it's loosening up we're I can turn it by hand, with both hands that is... Just can't figure out why mine would be so fat on 3 cylinders.. And on idle it feeds through hat so looks like it would all be spread out when it goes throughout blower... And it's a open bottom blower....

 

Do you have new plugs in it? Try swapping in new ones or changing your cold cylinder plugs to other cylinders and see if the problem follows.

 

Yes sir it is all bran new plugs. .. I will try that, man that would be a blessing to find out it was 3 bad plugs.. lol

 

We had a similar deal on a first start up. Way retarded on the Mag and we didn't know we had a cylinder swop cam in it !!! Took 2 mins to sort it.

 

What trans do you have? Maybe out of oil? If pressure is applied, may not turn backwards.

-Dale

 

Well thanks for all the replies... I pulled motor today I'm taking it back to engine builder.

 

Mike the ignition is at 30* I double checked the BV today and on a double set leak down gauges with 1 gauge at 100 psi the other one is on 30.. so that should be 30% leaking buy.. now the poppet I'm not sure about that. I will check that

 

I capped off everything ..only had the 6 in the hat open that air was going threw ....

 

if you take the air line off the gauge set do they both start at 0 ? or the first one at 0 and the 2nd at 100? if they both go the same way 0 to 100 then 30 is 70% leakage. there are a lot of different testers and any will work they just read different

 

Yes sir that's rite, both mine start at 0 and go the same way, so I set second one on 30 which is 70% leakage.. That's rite Huh?