300 build thread
Lead Driver
Joined: Jul 2007
Posts: 5,715
Likes: 1
i played with my brothers dui bare-handed kneeling on the radiator support. one thing to remember is that if it can shock you it will short to the engine and misfire. bigger better newer wires would be in order.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
I have a set of colored plastic cams, just like I had all those secondary springs I gave you.
Four things affect the pump shot.
1) When it comes. -Cam position relative to throttle position, which screw hole you use.
2) Cam profile. -How fast it comes on.
3) Volume. -Pump size (they come in 30 & 50cc) and lift of the cam. With your displacement and RPM's you don't need 50cc.
4) Duration. -The size of the jet(s) it's dumping through.
The same volume of fuel is going to take longer to get through a smaller shooter.
Enrichment is prolonged with a smaller jet.
Start with a rich shot and tune down to where you don't get a black cloud when you mat it. (rich may foul plugs, but it's safer than going lean, stumbling and detonating)
You also have a Powervalve in that carb, so when manifold vacuum drops below the number indicated it will richen the mixture too.
Ballpark rule of thumb; 1/2 to 1/3 of your idle vacuum. (i.e. 15"hg = 7.5 PV)
I don't know a thing about building the I-6 but what compression and cam are you using?
Four things affect the pump shot.
1) When it comes. -Cam position relative to throttle position, which screw hole you use.
2) Cam profile. -How fast it comes on.
3) Volume. -Pump size (they come in 30 & 50cc) and lift of the cam. With your displacement and RPM's you don't need 50cc.
4) Duration. -The size of the jet(s) it's dumping through.
The same volume of fuel is going to take longer to get through a smaller shooter.
Enrichment is prolonged with a smaller jet.
Start with a rich shot and tune down to where you don't get a black cloud when you mat it. (rich may foul plugs, but it's safer than going lean, stumbling and detonating)
You also have a Powervalve in that carb, so when manifold vacuum drops below the number indicated it will richen the mixture too.
Ballpark rule of thumb; 1/2 to 1/3 of your idle vacuum. (i.e. 15"hg = 7.5 PV)
I don't know a thing about building the I-6 but what compression and cam are you using?
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Postmaster
Joined: Jul 2009
Posts: 4,753
Likes: 5
From: Middletown, CT
I REALLY wish I had more expendable money so I could have a lot of fun with this. Unfortunately, at this point, I just want to eliminate most or all of the rust, and get it running well, and reliable.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
I understand, believe me, my '77 project is up on blocks.
May end up giving the F100 away before it returns to the earth.
The I-6 is supposed to be a torquey engine anyhow.
I guess it doesn't need compression???
May end up giving the F100 away before it returns to the earth.
The I-6 is supposed to be a torquey engine anyhow.
I guess it doesn't need compression???
Cargo Master
Joined: Apr 2002
Posts: 3,027
Likes: 9
From: Manchester, CT USA
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
Yeah Justin!
At least he got a new carb out of my need to salvage something from the project.
With my pitiful income, needing an expensive operation and a baby on the way there's no chance the 347 is ever going to happen...
At least he got a new carb out of my need to salvage something from the project.
With my pitiful income, needing an expensive operation and a baby on the way there's no chance the 347 is ever going to happen...