MatthewMcD
SILVER Star
- Thread starter
- #181
It has power and revs evenly. I'll do a video of 1-4 so y'all can hear it...tomorrow.
I can't drive 55
- Thread starter MatthewMcD
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
MatthewMcD
SILVER Star
- Thread starter
- #183
I need to get me one of those green buttons. Maybe a few of those covered toggle switches too.
Or "Fortunate Son"
I have a bunch of protected toggles, usually I just throw away the flip shield, its not like I have explosive bolts or nitrous boost to worry about.
pb4ugo
SILVER Star
Oil fill tube? Take a pic of what and where it's connected to. It probably should go to the pcv.
I have nothing to offer -- but I do check every day for an update. this thread has a life of its own and everyone is rooting for you. I am betting the weber sent over does the trick.
Without lock washers on the two carb studs to the adapter plate, I'd check that it is secure. Actually, it may need different studs.
@dkcrew Which Weber?
@77mustard40 I think that placement of the single barrel, dead-center on the manifold is perfect. The stock situation has a lot to desire. It puts the idle circuit closest to the 3-4 intake, with a serious radius for the flow of air/fuel. The tighter the radius, the more it works like a centrifuge, and less like laminar-flow. The diameter of the Rochester barrel is about the same as the 2F Aisan. I bought one of those Redline 2-barrel Weber to 1-barrel intake, to use it upside down for placement of a 1-barrel carb. I'm curious to see if I can run a '70 intake manifold on a 2F with a 1-barrel Rochester knock-off. Due to high altitude, I'm not sure that the secondary on my 2F Aisan ever gets enough vacuum to open up, and my two intakes for 2F are both sketchy where they were exposed to hot exhaust.
@dkcrew Which Weber?
@77mustard40 I think that placement of the single barrel, dead-center on the manifold is perfect. The stock situation has a lot to desire. It puts the idle circuit closest to the 3-4 intake, with a serious radius for the flow of air/fuel. The tighter the radius, the more it works like a centrifuge, and less like laminar-flow. The diameter of the Rochester barrel is about the same as the 2F Aisan. I bought one of those Redline 2-barrel Weber to 1-barrel intake, to use it upside down for placement of a 1-barrel carb. I'm curious to see if I can run a '70 intake manifold on a 2F with a 1-barrel Rochester knock-off. Due to high altitude, I'm not sure that the secondary on my 2F Aisan ever gets enough vacuum to open up, and my two intakes for 2F are both sketchy where they were exposed to hot exhaust.
Last edited:
sleepycruiser
I will get by….I will survive -Touch of Grey LC200
I’ve been following this from the beginning and every day I’m like ‘Is today the day?’
Meanwhile my 40 has no gas bc I’ve siphoned it all out.
Meanwhile my 40 has no gas bc I’ve siphoned it all out.
The Carb on my garden tractor looks bigger than that lol. Definitely make sure all the gaskets and such are tight and the studs are good, lots of points it could leak.
Reminds me of a similar story I heard about a Ford 300 with the one barrel carb; The guy had just bought the truck and it was running awful, turns out the carb wasn't even bolted down onto the manifold and was just sitting there. It still ran though!
Can't wait to see the conclusion on this one, it has been a very enjoyable thread!
Reminds me of a similar story I heard about a Ford 300 with the one barrel carb; The guy had just bought the truck and it was running awful, turns out the carb wasn't even bolted down onto the manifold and was just sitting there. It still ran though!
Can't wait to see the conclusion on this one, it has been a very enjoyable thread!
MatthewMcD
SILVER Star
- Thread starter
- #190
Without a PCV valve, I don't understand how the engine is regulating how much blow-by it receives in the intake. It is like the other intake charge, not quite air or fuel, but, blow-by. The plumbing is there, but, it seems incomplete.
I'm guessing that the lack of a PCV valve is worthy of further inquiry. My guess is that no PCV valve is hurting your speed. Not sure where to find one though. Can a later engine side-cover be installed on an early F so that you have common/available parts to work with?
I'm guessing that the lack of a PCV valve is worthy of further inquiry. My guess is that no PCV valve is hurting your speed. Not sure where to find one though. Can a later engine side-cover be installed on an early F so that you have common/available parts to work with?
pb4ugo
SILVER Star
I agree, I wonder if that carb can handle that big of a leak. Try plugging that line and drive around the block and see if it goes better. If it runs better then i might put a pcv in it. I consider that a possible vacuum leak. The carb may need more of a restriction.
Regarding PCV, it is recommended the Sniper EFI utilize a continuous flow type PCV. The original one is typical and has the ball style check valve but the new one seems to be nothing more than a 3/32 hole in a metal can. It can blow from either side.
Can someone explain this for me? It seems like a fixed vacuum leak
Can someone explain this for me? It seems like a fixed vacuum leak
pb4ugo
SILVER Star
It is a controlled vacuum. B4 the pcv was required engines had some form of crankcase vent to relieve internal pressure from blowby. The blowby was vented to the atmosphere. Pcv requires the engine to burn the crankcase fumes and relieve pressure. It's a good emissions requirement.
Does the filler pipe port have a restriction in it?
Does the filler pipe port have a restriction in it?
I’d try and block off that hose to the oil fill as I think it’s a big vacuum leak? Mine on my 45lv I just vent to atmosphere. I think it should vent to the air cleaner top (not used port in the pic) where it’s connected it will be a vacuum leak?My2c.
77mustard40
SILVER Star
Seems like he’d be struggling with idle if that hose was a vacuum issue, Matt says the motor purrs and pulls up to a point. I’m not familiar with the F engines so I Googled images and that hose is common so I’m doubting that is the issue.
Do we know if the dizzy is advancing with vacuum?
Do we know if the dizzy is advancing with vacuum?
The PCV valve is described in Haynes as dynamic, it adjusts with the amount of vacuum/throttle, even allowing it to purge via the air cleaner assembly, thru the rocker cover. It fully closes during back-fire to prevent the crankcase from explosion, or so I've been told. The issue is that when it opens and closes, it makes the O2 sensor reading off, so the computer can't effectively tune-in by learning. A constant 3/32 bleed will be adequate for purging corrosive gasses from the crankcase, and allow the Sniper to do its thing. A similar thing happens with my carb and O2 readout on an engine with EGR, when EGR kicks in, it reads lean, really lean because there is quite a bit of O2 remaining in exhaust gas even when the fuel is basically consumed, and the read-out on the dash doesn't factor-in that I'm running EGR when the engine is warm.
SOR lists a PCV valve from '58 to 9/71 which works with the oil filler neck. They don't have early valves or grommets in stock.
You can see that same line in my PFP on my 74, it restricts a bit when it goes into the intake to carb adapter. If your engine is all sealed up and the line is good It shouldn't cause a problem.
Any valve that I would imagine would just be in case of backfire and shouldn't really cause any sort of issue.
Any valve that I would imagine would just be in case of backfire and shouldn't really cause any sort of issue.
Wow! Great explanation… with the little bit of knowledge I have on the sniper…this is all very logical….thank-you
