Throttle body

[jojackson4]

After looking at the 72mm upgrade to the plenum and seeing how much it was I have decided to go down the pre made unit road 75mm


The point of no return



And a bit of a clean up ready for the new flange to be claged on

[Classic Chim]

Foookin hell, have you even sharpened up the divider,,, nice
You need every hp you can get, 12.60 is a tough ask,,,,

[jojackson4]

Classic Chim said:

Foookin hell, have you even sharpened up the divider,,, nice
You need every hp you can get, 12.60 is a tough ask,,,,

Yes and reshaped the radis on the iner casting
You can shave with the divider

[Classic Chim]

jojackson4 said:

Yes and reshaped the radis on the iner casting
You can shave with the divider

That’s a lovely bit of work there dude

[Sardonicus]

And a bit of a clean up ready for the new flange to be claged on

[/quote] Not seen knife edging like that since my 2 stroke days nice progress

[jojackson4]

Bit more done

[rev-erend]

Very nice.

[Tonymg]

Men in Sheds Lov it....

im all so doing things all the time I just cant help it..

iv been thinking of doing stuff like that but just ant got the balls to do it YET!!!

[jojackson4]

Claged it together

[indigochim]

Looks fantastic, shame it looks beyond my DIY skills.

[blitzracing]

jojackson4 said:

After looking at the 72mm upgrade to the plenum and seeing how much it was I have decided to go down the pre made unit road 75mm


The point of no return



And a bit of a clean up ready for the new flange to be claged on

This should be interesting for low speed air metering and throttle response more than out and out BHP.

[jojackson4]

blitzracing said:

This should be interesting for low speed air metering and throttle response more than out and out BHP.

I have no AFM
Running emerald

[blitzracing]

Its not so much the AFM is a factor, but the accurate metering of low air flows at smaller throttle openings becomes much poorer as the size of the butterfly increases. I have no idea if this be an issue for you- hence the interest.

[jojackson4]

blitzracing said:

Its not so much the AFM is a factor, but the accurate metering of low air flows at smaller throttle openings becomes much poorer as the size of the butterfly increases. I have no idea if this be an issue for you- hence the interest.

I asked the man before I started as I was looking at 90-95mm jobs and was advised not to go that big for the small throttle inputs getting a bit on off ish

Hopefully 75mm is on the money
But proof will be in the pudding
And it’s all on a spare plenum

[carsy]

Lovely work. Keep us posted.

[Steve_D]

blitzracing said:

Its not so much the AFM is a factor, but the accurate metering of low air flows at smaller throttle openings becomes much poorer as the size of the butterfly increases. I have no idea if this be an issue for you- hence the interest.

That's why you have twin choke carbs.

Steve

[Classic Chim]

All this light throttle talk,,,, he’s only after one thing and it ain’t light throttle settings

[Sardonicus]

Yes but an over large throttle will make small throttle openings an a progressive throttle a thing of the past think more On/Off switch although at the size Paul as opted for I think he will be fine