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Having some issues getting the carb to idle smoothly at the idle spec. I can't get it to idle smooth at 700 rpm, but at higher elevation it does. So it needs a mixture adjustment. Debating just getting a Weber, and installing a 02 sensor and gauge to tune it properly. Probably my best bet. That, or I will make my own manual choke and manual throttle. Both would be easy to install. Weber sounds easier. Sent from my PH-1 using Tapatalk
I love the stock carb, and I have had excellent success with the Weber as well. The three reasons I was stuck on the Aisan carb was the fact that it is good at angles, it's ability to adjust itself for elevation and the cold start features. What I have found with the Weber is that it is great off road with the "hill climb mod" super easy and quick to make adjustments to jetting if needed and much to my dismay it even spanks the Aisan for the cold weather start.I have been starting up my Weber at -17-20 F the last week or so with no block heater or anything.Either way you can't go wrong. The Aisan can certainly be made to go with a little tweaking and some better air. The Weber is just easier to mess with and you get more tuning options. The downsides I thought were there with the Weber just aren't really there.That's all I have to say about that...
Now that I can finally post... I feel I'd fill everyone in on what I've done! I went ahead and bought a Weber. Well, way more than that. I bought a Weber 32/36, with the manual choke. Installed really easily earlier today. Haven't started the truck up yet. Now, I know the Weber 2 piece adapter is just junk, nothing can be done. So I went ahead and bought a Offenhauser intake manifold. I went with the single plane one. I prepped the gaskets on the 2 piece adapters with a fuel safe gasket sealer. Instructions say to use a sealer/grease. I didn't use anything on where the carb mounts to the adapter. This clears up the issue with the carb adapter, and it flows more. Flow isn't a leading cause for me to buy it, since my stock exhaust/unported head means it won't really add any power. I also am sure my intake manifold may be leaking, if I saturate the underside of the intake manifold it stumbled slightly. Not sure if it was a random stumble or not. Either way, I'm excited to get the new intake. Now, tuning is one of the most trickiest parts for getting the Weber to run properly. So I bought a Air Fuel ratio gauge from Glowshift gauges. It'll require me to weld a 02 sensor in the exhaust, but it's worth the troubles. This will allow me to FULLY tune this carb and get it running how it should! I'm very happy I took everyone's advice! I bought a high altitude jet kit so I can tune it beyond adjusting the screws. I'm at 4200' which is considered high altitude for the stock jet in the carb. I got a few more odds and ends, a fuel pressure gauge/regulator. And the install kit for the intake, as it requires me to plumb the heater lines different. No biggie. What do you all think? Good choice? Thanks for the helpful advice. While the forum was down, I started a write up on Pirate4x4 and have gotten nothing but crap from what I've spent and done to this truck. Guess I know which forum I'm loyal to. Sent from my PH-1 using Tapatalk
The 32/36 is jetted towards the lean side in its stock form, so I advise to try it as is as a baseline before tuning. You will want between 12 and 13:1 at WOT, ideal being 12.5-12.8:1. At cruising highway, around 15-15.5:1, and idle being whatever it likes best, usually pretty rich. I suggest playing with the timing at they seem to like a bit more than stock at around 8btdc initial. Any a/f change above 4000rpms it made with the air correctors, and below that with the main jets. A good recommended float setting is 18mm & 28mm for a weber 38 at least. Thanks for sharing your project with us!
I will add a tid-bit of my experience with Weber carbs…They are very sensitive about “cleanliness”! I sand railed in the sand and dusty environment, so I learned to make sure my Weber was happy breathing “bad” air at times. Ingesting even the tiniest piece of dust or sand would upset my Weber.I had 2 external inline fuel filters from the gas tank to carb.I spent lots of time cleaning the air filters and air filter canister and carb mount, and making sure the ambient air supply was filtered and the air cleaner was sealed well.During my sand railing days I only have about 8 years of experience with air filters, and especially K&N. I have posted a number of times my experience with K&N air filters and I’m not a big fan the them for a number of very good reasons, based upon MY particular experiences.Gnarls.
I think you will like the Weber. Get yourself a range of jets and air correctors and you will be able to tune out any hesitations or flat spots. There will even be a jet for your secondary that makes it hammer down if you want it too, or the next one leaner will save a little gas. On your air cleaner plate, I would take it off and flatten it out on an anvil or something and then just don't tighten the nuts down so hard.
Great tech here on this thread! I'm also casually thinking about Weberizing my truck for the mileage (it's likely going to see thousands of miles this summer), and I greatly appreciate your time and effort to document stuff.I'll also be keeping my ears peeled for news on the mileage of the Weber vs Aisin carbs
Are you sure that is where the mechanical water temp gauge goes?Gnarls.
Finally installed the intake! It was really easy......Super stoked. It starts up so incredibly quickly. Love the Weber...I've had countless people tell me how dumb and stupid I am for installing this carb, but I am so happy that I did.
Hey T....Glad you got it installed. Reads like you have your rebuild finally at the stage where you get to enjoy the tweaking and tuning part. As you have discovered, everyone has an opinion but when you do a reality check and find out for yourself, you'll have a different attitude about what "countless people" tell you.I suggest you check and recheck the mounting bolts on that intake manifold, it hangs off the side of the block with very little extra support. I really enjoy following your project. Gnarls.
Use a fuel injection hose clamp
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