A heart with no body; the Turbo 10hp Briggs & Stratton. Aka Timebomb.(56K beware!)
- Thread starter 65ShelbyClone
- Start date
It's been a while since I worked on the engine, but I had some free time today and decided to try out a new non-turbo fuel map for gasoline. Not 20 seconds after I got it running, the fuel pump came unglued...literally. The silicone holding the fuel inlet adapter on had melted and vibration finished it. The fuel pump fell off followed by a half gallon of stale gas. Luckily the whole mess didn't catch on fire. That's partly why I like methanol; you can put it out with water. I used JB Weld this time and a lot of it.
Anyway, the new fuel map looked promising, so expect more progress tomorrow and maybe this weekend. I might just go ahead and convert the ignition over to an automotive coil ahead of schedule. Once I get a proper trigger wheel I'll be able to do full spark control......and turbo antilag. :shifty:
Anyway, the new fuel map looked promising, so expect more progress tomorrow and maybe this weekend. I might just go ahead and convert the ignition over to an automotive coil ahead of schedule. Once I get a proper trigger wheel I'll be able to do full spark control......and turbo antilag. :shifty:
Did a little more "shakedown" running today. I waited overnight for the JB to cure and resumed this afternoon.
With that, a new problem reared its ugly head; my one-off, abused, second-hand, corroded, and modified Bosch 35lb/hr injector failed. It stuck open and I couldn't clean it out enough to make it work, so I resorted to using one of the 19lb/hr(200cc) Suzuki injectors that came with the throttlebodies. I adjusted the MegaSquirt for the smaller injector and it fired right up and sat there idling at 1100rpm while I datalogged everything that was happening. It caught revs pretty well even though the whole tune is painfully rich. I don't have the turbo installed right now, so that's how I'm getting away with the small injector.
With that, a new problem reared its ugly head; my one-off, abused, second-hand, corroded, and modified Bosch 35lb/hr injector failed. It stuck open and I couldn't clean it out enough to make it work, so I resorted to using one of the 19lb/hr(200cc) Suzuki injectors that came with the throttlebodies. I adjusted the MegaSquirt for the smaller injector and it fired right up and sat there idling at 1100rpm while I datalogged everything that was happening. It caught revs pretty well even though the whole tune is painfully rich. I don't have the turbo installed right now, so that's how I'm getting away with the small injector.
I was able to clean out my one-off injector and get it working again. I ran the engine N/A and also some with the turbo installed, but not hooked up to the intake. I shot a bunch of video and somehow managed to lose the clip with the best turbo spooling sound. 
I'll have some compiled into a video tomorrow.
In other news, I think I hurt the motor. The fuel base map I have been running is "mosquito fogger" rich. I suspect that the cylinder got washed down and that's why it.......seized. Yeah, it locked up on me. The crank still had end-to-end play, so I knew it was in the cylinder. I put a wrench on the crank, freed it up, put a little oil in the cylinder, and cranked it over until it freed up some more. Compression was suddenly low, but still enough to run. In a desperation move, I mixed some gas and a little low-ash synthetic blend Maxima 2-stroke oil. The idea is for the oil to act as a top end lube until I can properly lean out the fuel map. I ran it that way a little bit and compression came back up, but I also got lots of new exhaust smoke. It doesn't smell like 2-stroke mix either; it smells like crankcase oil. I may pull the head off and take a look. If the injury is terminal, I'll probably transfer the turbo setup to a used-up Kohler K301 I have.
I'll have some compiled into a video tomorrow.In other news, I think I hurt the motor. The fuel base map I have been running is "mosquito fogger" rich. I suspect that the cylinder got washed down and that's why it.......seized. Yeah, it locked up on me. The crank still had end-to-end play, so I knew it was in the cylinder. I put a wrench on the crank, freed it up, put a little oil in the cylinder, and cranked it over until it freed up some more. Compression was suddenly low, but still enough to run. In a desperation move, I mixed some gas and a little low-ash synthetic blend Maxima 2-stroke oil. The idea is for the oil to act as a top end lube until I can properly lean out the fuel map. I ran it that way a little bit and compression came back up, but I also got lots of new exhaust smoke. It doesn't smell like 2-stroke mix either; it smells like crankcase oil. I may pull the head off and take a look. If the injury is terminal, I'll probably transfer the turbo setup to a used-up Kohler K301 I have.
You might need a cheap clone Honda motor. They even come with steel sleeves in them.
Hey I have a new name over on that other site. It screwed me up a little. I was doing business with a few guys over there. I'm still trying to figure out there user names and match them to my emails. I can't check my old user name PM's.
Hey I have a new name over on that other site. It screwed me up a little. I was doing business with a few guys over there. I'm still trying to figure out there user names and match them to my emails. I can't check my old user name PM's.
Too bad there aren't any cheap GX670 clones. I'd be all over that. I wouldn't go with anything smaller than a 390 if I go with another engine. I know! How about two 5 or 8hp flatties tied together like a 10-16hp twin with the EFI and turbo? I'd really like to get one of the big upright Tecumseh OHV engines. They look a lot like an 18hp Kohler K361.
How many usernames do you have over there now? It's something like four, isn't it? I didn't see anything over there that was ban-worthy. Maybe it was because you challenged something Mike said. :001_rolleyes: IMO, the "racers" over there tend to take things(and themselves) a little too seriously sometimes.
How many usernames do you have over there now? It's something like four, isn't it? I didn't see anything over there that was ban-worthy. Maybe it was because you challenged something Mike said. :001_rolleyes: IMO, the "racers" over there tend to take things(and themselves) a little too seriously sometimes.
Last edited:
I said I'd deliver a video today and I did! A whole 45min to spare!
When I uploaded it it was about 6mb(down from 400+!), so expect a couple minutes for it to load.
I played with the fuel map today and leaned it way the heck out. I must have pulled out 25% and it just kept running cleaner and cleaner. Still smoking, though. I might try straight gas in it again to see if the blue clouds thin out at all.
When I uploaded it it was about 6mb(down from 400+!), so expect a couple minutes for it to load.
I played with the fuel map today and leaned it way the heck out. I must have pulled out 25% and it just kept running cleaner and cleaner. Still smoking, though. I might try straight gas in it again to see if the blue clouds thin out at all.
Last edited:
