country fried 6
Well-known member
that sounds like a Tillotson carb used on snowmobiles in the 70's and weedwackers and the like up to this day. no float bowl just a vacuum pulse fuel pump mounted to the side.
country fried 6":9lo8gz0c said:that sounds like a Tillotson carb used on snowmobiles in the 70's and weedwackers and the like up to this day. no float bowl just a vacuum pulse fuel pump mounted to the side.
johns3524":2k7eh3oz said:pmuller9":2k7eh3oz said:I was thinking about the possibility of using mechanical fuel injection where you can manually control the main and secondary bypass and have full control of the fuel. No carb and the problem of boost referenced fuel pressure goes away.
Just a thought.
Something to think about..and read up on of course..I'm sure they've made some advances since inception years ago..and since we're reading how about this?
https://en.wikipedia.org/wiki/Pressure_carburetor
AND: https://en.wikipedia.org/wiki/Bendix-Stromberg_pressure_carburetor
ps5 style actually ebay has a cple that were used on O470CI continentals in the 50-60s 230HP...well, more thinking I know.
I have decided to buy the leaning device from the maker as soon as he can ship, and try it on one of my Holley's' on the DD I have now. that may tell me if that type of thing is workable..
pmuller9":3bkipmwc said:johns3524":3bkipmwc said:pmuller9":3bkipmwc said:I was thinking about the possibility of using mechanical fuel injection where you can manually control the main and secondary bypass and have full control of the fuel. No carb and the problem of boost referenced fuel pressure goes away.
Just a thought.
Something to think about..and read up on of course..I'm sure they've made some advances since inception years ago..and since we're reading how about this?
https://en.wikipedia.org/wiki/Pressure_carburetor
AND: https://en.wikipedia.org/wiki/Bendix-Stromberg_pressure_carburetor
ps5 style actually ebay has a cple that were used on O470CI continentals in the 50-60s 230HP...well, more thinking I know.
I have decided to buy the leaning device from the maker as soon as he can ship, and try it on one of my Holley's' on the DD I have now. that may tell me if that type of thing is workable..
Looks like barometric controlled mechanical throttle body fuel injection. Thanks for the links. Good stuff.
There seemed to be a lot of advances in piston engine tech up to the end of WWII. 4 valve heads roller valve trains ect... Then we kinda took a few steps backwards for a while.
Here is a link to someone that has a lot of miles with their converted Holley 2300.
http://www.binderplanet.com/forums/show ... stcount=14
http://www.binderplanet.com/forums/show ... stcount=16
He was using the Percy Adjust-a-jet.johns3524":wpggd02i said:good input..I notice that that posting talks about a different approach as the one I'm considering but good to look at none the less.
The Percy adjust a-jet ..
I have the hope that the Device I'm looking at is a complete adjust form idle-cutoff to full rich with a lever..not an adjustment screw..we'll see.
pmuller9":1hz45tbw said:He was using the Percy Adjust-a-jet.johns3524":1hz45tbw said:good input..I notice that that posting talks about a different approach as the one I'm considering but good to look at none the less.
The Percy adjust a-jet ..
I have the hope that the Device I'm looking at is a complete adjust form idle-cutoff to full rich with a lever..not an adjustment screw..we'll see.
He connected a cable to the adjustment screws so adjustments could be made from the driver.
What would be different?
johns3524":2sa98sp5 said:This device is actually a full range from idle-cutoff, or full lean to full rich (at least as advertized). It has a lever on the SIDE of the block that will hook directly to an aircraft style McFarland or other mfg 's vernier cable.
http://www.mcfarlane-aviation.com/Products/?PartNumber=MC600-72
http://www.rotaryeng.net/HOW-TO-INSTALL-HOLLEY.html
I must admit I've only been in-touch via-e-mail. I probably should reserve judgement till I actually view it in my hand.
pmuller9":lco8lp9w said:johns3524":lco8lp9w said:This device is actually a full range from idle-cutoff, or full lean to full rich (at least as advertized). It has a lever on the SIDE of the block that will hook directly to an aircraft style McFarland or other mfg 's vernier cable.
http://www.mcfarlane-aviation.com/Products/?PartNumber=MC600-72
http://www.rotaryeng.net/HOW-TO-INSTALL-HOLLEY.html
I must admit I've only been in-touch via-e-mail. I probably should reserve judgement till I actually view it in my hand.
This is really cool stuff that I didn't know was available.
The Mcfarlane unit has a 90* turn from off to full rich. That seems to be a little coarse making it hard to make very small adjustments but like you said, wait until the unit is in your hands.
Which Holley carb will you be testing this on?
johns3524":1xg4tyx3 said:I actually like the the lower pressure approach of the "draw thru" of "can this work".....makes it all even simpler..and my other controls work as well..less fabbing.. no inter-cooler..and I am familiar with draw thru..well..need to get an engine built first..
pmuller9":1eg1jtkb said:There are reasons why you see mainly “blow thru” carburetor setups for turbo applications rather than “draw thru” ......detonation then the engine torque will decrease even more.
Hope this is helpful
johns3524":3pzfnqyf said:BTW, here's another question for ya...
Have you seen a gauge that can measure and display degrees of advance BTDC live in real time INSIDE THE CAB? You'd think someone would build that into a tach readout...
pmuller9":38qs91zl said:johns3524":38qs91zl said:BTW, here's another question for ya...
Have you seen a gauge that can measure and display degrees of advance BTDC live in real time INSIDE THE CAB? You'd think someone would build that into a tach readout...
I haven't use it but here is one
https://dl.dropboxusercontent.com/u/39382077/dsg1401brochure.pdf
johns3524":305vofid said:pmuller9":305vofid said:johns3524":305vofid said:BTW, here's another question for ya...
Have you seen a gauge that can measure and display degrees of advance BTDC live in real time INSIDE THE CAB? You'd think someone would build that into a tach readout...
I haven't use it but here is one
https://dl.dropboxusercontent.com/u/39382077/dsg1401brochure.pdf
Another thing I've been thinking about is using the HD exh manifold that Stevens sells. And since this IS a ground-up turbo build, why not use the stock log? (intake) Doing both of those things might be a space saver, in addition to being unique. I just have to get comfortable machining that intake for a good seal for a 2 barrel..thoughts?...
bubba22349":2xiq4kuf said:I don't think you could machine the stock intake enough to gain any performance over just using a 2V to 1V adapter. However if your comfortable welding cast iron you could slice the 1 V center section out (carb base) and build a 2 V center out of steel plate or tubing to replace it. From my A&P mechanic training I do like your ideas on being able to adjust timing and fuel mix from the cab, good luck on your build
bubba22349":mp02j253 said:I don't think you could machine the stock intake enough to gain any performance over just using a 2V to 1V adapter. However if your comfortable welding cast iron you could slice the 1 V center section out (carb base) and build a 2 V center out of steel plate or tubing to replace it. From my A&P mechanic training I do like your ideas on being able to adjust timing and fuel mix from the cab, good luck on your build