d.p Posted April 9, 2021 Author Report Share Posted April 9, 2021 1 hour ago, datzenmike said: Did you swap the 2 and 3 wires see if it moves to the #3 plug? Easy and cheap. yes and no difference whatsoever. 1 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 Ok got the leak down tester. Anyone got tips on how to do this the right way? And easiest way to get #2 to TDC? 1 Quote Link to comment
datzenmike Posted April 10, 2021 Report Share Posted April 10, 2021 Why the tester? didn't you say your compression was 180 across the board? Leak down is for identifying where compression loss is.... intake or exhaust valve or rings, possibly a blown HG. 2 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 1 hour ago, datzenmike said: Why the tester? didn't you say your compression was 180 across the board? Leak down is for identifying where compression loss is.... intake or exhaust valve or rings, possibly a blown HG. yes but was told need to do leak down to see what is causing #2 to foul. I guess when you do a leak down test and air escapes out the valve seal you’ll hear it. Am I wrong? 1 Quote Link to comment
Draker Posted April 10, 2021 Report Share Posted April 10, 2021 1 hour ago, d.p said: yes but was told need to do leak down to see what is causing #2 to foul. I guess when you do a leak down test and air escapes out the valve seal you’ll hear it. Am I wrong? more likely you’ll hear it out the exhaust or intake, not specifically the valve seal. 1 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 Ok so when I first did #2 it wasn’t at TDC which allowed air out fo the carb. So I got both lobes pointing up and it came back like below. All 4 cylinders came back with less than 10% loss so now what? 1 Quote Link to comment
mainer311 Posted April 10, 2021 Report Share Posted April 10, 2021 Did you have the head rebuilt? Sounds like you have bad guides and/or seals based on the Ratsun facebook page. Time for the rope method, like Mike suggested. 1 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 13 minutes ago, mainer311 said: Did you have the head rebuilt? Sounds like you have bad guides and/or seals based on the Ratsun facebook page. Time for the rope method, like Mike suggested. yeah man. I just finished swapping the carbs from front to back and will see if #4 fouls now. If still #2 then I know the problem is that cylinder/valve. 1 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 Alright well it’s defiantly carb related. Number 4 on the right number 2 on the left after swapping them. Can clearly see #4 is now fouling. 1 Quote Link to comment
datzenmike Posted April 10, 2021 Report Share Posted April 10, 2021 Compression is good at 180 so valves/rings are sealing. Can't hear air out a valve guide it's on the other side of the valve face. Well good on the carburetor, know you know. 1 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 I know that it’s the carb but no idea what on the carb. Bad or clogged jets? 1 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 One thing I did notice is the problem side of the carb has a vacuum port on it. But I was told not to use it so I just capped it off. I am under the impression that it’s not needed with dual mikunis. 1 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 (edited) Well I think I cracked this case. Can anyone guess what the difference is here?? Edited April 10, 2021 by d.p 1 Quote Link to comment
datzenmike Posted April 10, 2021 Report Share Posted April 10, 2021 Ta Daaaaaa Ba DUMmmmm Tissssssssssssss! 1 Quote Link to comment
thisismatt Posted April 10, 2021 Report Share Posted April 10, 2021 21 minutes ago, d.p said: Well I think I cracked this case. Can anyone guess what the difference is here?? Left is you, right is the guy she said not to worry about? 1 3 Quote Link to comment
mainer311 Posted April 10, 2021 Report Share Posted April 10, 2021 Well. Shit. 1 1 Quote Link to comment
d.p Posted April 10, 2021 Author Report Share Posted April 10, 2021 Yeah crazy that’s what it ended up being. Amazing what an engine will do when the carb isn’t dumping fuel into one of the cylinders. But good cause it means I built this fucker right and everything is as it supposed to be Oh boy! This fucking thing rips now in every gear. I have the tach set to 7K and I have bee reviving it up close to that and it hauls. Until now I had no idea what a cam’d and bored L20b was supposed to feel like and it is fucking titties. Runs cooler and so much smoother now as well. Even though it took me nearly a month to figure all this out after getting it running it was well worth it. Part of me just wanted to sell it if I couldn’t figure out out of pure frustration. I didn’t want to spend another dime on it either but all that is dust in the wind (for now). For sure the suspension is suspect with how fast the truck is now. Lots of roll into turns. 4 Quote Link to comment
demo243 Posted April 10, 2021 Report Share Posted April 10, 2021 1 hour ago, d.p said: Yeah crazy that’s what it ended up being. Amazing what an engine will do when the carb isn’t dumping fuel into one of the cylinders. But good cause it means I built this fucker right and everything is as it supposed to be Oh boy! This fucking thing rips now in every gear. I have the tach set to 7K and I have bee reviving it up close to that and it hauls. Until now I had no idea what a cam’d and bored L20b was supposed to feel like and it is fucking titties. Runs cooler and so much smoother now as well. Even though it took me nearly a month to figure all this out after getting it running it was well worth it. Part of me just wanted to sell it if I couldn’t figure out out of pure frustration. I didn’t want to spend another dime on it either but all that is dust in the wind (for now). For sure the suspension is suspect with how fast the truck is now. Lots of roll into turns. Wahooo! Now the fun begins! I just threw FutoFab sways on the 620. Only one quick drive on it so far, but felt a difference there. Truck is blocked in right now... but maybe next week Ill get to truely take it for a spin! I suspect the sway are going to really make a difference. I dont really want to stiffen up the suspension much, since part of what I like about it is how soft it is compared to the 510. 1 Quote Link to comment
datzenmike Posted April 10, 2021 Report Share Posted April 10, 2021 The sway bar has no effect on bumps felt by both tires such as a speed bump across both wheels. It acts only when one wheel drops into a dip or goes up over a bump, then it applies resistance from the other wheel to try and even it out. It's main purpose is in a hard turn where the body tries to roll over onto the outside wheel and the inside wheel resists this averaging it out. It won't feel stiffer in the ride but it will sit more level on tight fast turns. 2 Quote Link to comment
d.p Posted April 11, 2021 Author Report Share Posted April 11, 2021 I guess I never drove my truck this fast with the l16 and 4 speed so it was fine. But now it just seems loose at high speed which is new to me and the truck. took my son for a drive and he loved it. It really is night and day compared to the stock drivetrain. Now I need to figure out the trans tunnel cover and get a Nardi steering wheel. Need to put the hood back on as well. 2 Quote Link to comment
Charlie69 Posted April 11, 2021 Report Share Posted April 11, 2021 I prefer the ride and handling of the 720 ball joint front suspension over the 521 kingpin. Quote Link to comment
bilzbobaggins Posted April 11, 2021 Report Share Posted April 11, 2021 So, they forgot a jet on the end of an emulsion tube? Or it had backed out? Unfamiliar with these carbs. If it was dumping a turd ton of fuel in, hows the oil in the block? Quote Link to comment
d.p Posted April 11, 2021 Author Report Share Posted April 11, 2021 It fell/backed out and I turn was dumping fuel into the cylinder. Oil is fine just changed it not too long ago. Quote Link to comment
thisismatt Posted April 11, 2021 Report Share Posted April 11, 2021 49 minutes ago, d.p said: It fell/backed out and I turn was dumping fuel into the cylinder. Oil is fine just changed it not too long ago. I think he asked because that much fuel can wash the cylinder walls and also get into the oil... 2 Quote Link to comment
greenthumb Posted April 11, 2021 Report Share Posted April 11, 2021 1 hour ago, thisismatt said: I think he asked because that much fuel can wash the cylinder walls and also get into the oil... Concur. id be changing that oil to protect that peppy new power plant of yours 2 Quote Link to comment
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