Hd18b in my ms460

[MG porting]

Ok I got board so I brought both my Saw's in ms440 with the Walbro hd17a sorry for the bad light batteries where dying lol. and ms460 with the Walbro hd18b this pretty much sums up what Lightning performance told me today.

 

[huskyboy]

Ok I got board so I brought both my Saw's in ms440 with the Walbro hd17a sorry for the bad light batteries where dying lol.View attachment 230251 and ms460 with the Walbro hd18b this pretty much sums up what Lightning performance told me today.View attachment 230253

Your measuring the throttle bore, you have to stick the calipers in a little further to measure the “venturi” of the carb.

 

[MG porting]

Your measuring the throttle bore, you have to stick the calipers in a little further to measure the “venturi” of the carb.

I'll do that tomorrow might have to pole carbs out to do that and I just put them away don't want the woman thinking that I've gone crazy or something.lol

 

[Canadian farm boy]

Your measuring the throttle bore, you have to stick the calipers in a little further to measure the “venturi” of the carb.

Thank you.

 

[MG porting]

Thank you.

Well call me crazy sorry Canadian farm boy but I must have a odd ball carb. Hd18b. and hd17a. I checked and re checked that's what I got why there the same and not supposed to is beyond me.

 

[Canadian farm boy]

You’re measuring the bore. It’s the Venturi that’s different.

 

[Wonkydonkey]

This thread is getting boring.



and interesting at the same time

 

[Deets066]

Well call me crazy sorry Canadian farm boy but I must have a odd ball carb. Hd18b.View attachment 230263 and hd17a.View attachment 230271 I checked and re checked that's what I got why there the same and not supposed to is beyond me.

Your likely not gunna be able to reach the Venturi from the intake side of the carb

 

[MG porting]

Your likely not gunna be able to reach the Venturi from the intake side of the carb

It don't really matter at this point I'm still going to stick with my idea and see what happens my thinking is it's going to be a pretty good setup who knows might start a new trend.

 

[Deets066]

It don't really matter at this point I'm still going to stick with my idea and see what happens my thinking is it's going to be a pretty good setup who knows might start a new trend.

So your plan is to run a smaller Venturi carb on a ported saw. Have tons of signal, pull too much fuel so then in turn put a smaller jet to compensate?

Giving the jug less air and fuel, even at the correct ratio is not gunna produce more power.

 

[MG porting]

So your plan is to run a smaller Venturi carb on a ported saw. Have tons of signal, pull too much fuel so then in turn put a smaller jet to compensate?

Giving the jug less air and fuel, even at the correct ratio is not gunna produce more power.

The saw isn't lacking power it just drinking to much fuel on the high side it's a half turn out from bottom with the .66 jet so putting a .60 or .58 should put it at one full turn out again the saw makes damn good power.

 

[huskihl]

“Handy as a smaller carb on a ported saw”.


I mean, it could take off, but.....

 

[dall]

The saw isn't lacking power it just drinking to much fuel on the high side it's a half turn out from bottom with the .66 jet so putting a .60 or .58 should put it at one full turn out again the saw makes damn good power.

you port a saw and worry about fuel usage ? let me guess you drive one of those smart car casket on wheels ?

 

[redlight066]

Must be the elivashun

 

[MG porting]

you port a saw and worry about fuel usage ? let me guess you drive one of those smart car casket on wheels ?

Nope drive a 1975 Ford highboy with a 1969 460 under the hood. But always wanted to put one of those cars in the bed of the truck and drive around town tho.

 

[dall]

Nope drive a 1975 Ford highboy with a 1969 460 under the hood. But always wanted to put one of those cars in the bed of the truck and drive around town tho.

well starving a saw of fuel or air and you will not get it to run right
and even if venturi is the same on the 18 compared to a 16 the brass inner parts will be different id toss that 18 in the trash and get a real carb
i dont even have a 18 on my 290 it wear a hd11

 

[RI Chevy]

I copied from someone on here or somewhere.

 

[RI Chevy]

My hand written list has one correction. HD18 has smaller venturi size. 16.74.
Sorry for any misunderstandings.
Edited for correctness...

 

[Wonkydonkey]

My hand written list should say bore size, not venturi size.
Sorry for any misunderstandings.

Can’t you rewrite it and repost it.. for my small brain to understand

 

[RI Chevy]

I suppose I could...

On edit. The venturi size is correct at 17.46.

The exception is the HD18 carb. It has 16.74 venturi.