ameristar1
The One Blue Thing
How much compression do you lose by removing the glowplugs? Can a couple of high powered grid heaters be enough to light the motor off, if the compression and injection system are healthy?
NO MORE GLOWPLUGS?
- Thread starter ameristar1
- Start date
Compu Doc
Full Access Member
Your compression would go down to zero if you removed all glow plugs. When you do a compression check on the engine you use the glow plug ports to check it.
argve
Resident Fruitcake
John, he is going to plug the holes with a pipe plug so it wouldn't be an open port.....
argve
Resident Fruitcake
I always thought it was infinite... I can put a gallon can of gas in the bed and drive until doomsday with it back there and never use a drop....
Metalmacguyver
Full Access Member
So we need an accurate measurment of the volume of a glow plug and some one that has the time to do the math to recalculate the compression ratio..........
Dsl_Dog_Treat
I lost my face to the jaws of a poodle
Plus the void not filled by the plug also.
My thinking has me wondering where the grid heaters could be placed to work effectively.
I think it would have to go under the turbo intake hat. If you had an intercooled rig, somewhere further upstream would definitely not work! 
The "plug" would have to go all the way in and seat the same way a glow plug does. Probably the easiest way would be to try and modify a glow plug by gutting it and welding the end of it shut.
The "plug" would have to go all the way in and seat the same way a glow plug does. Probably the easiest way would be to try and modify a glow plug by gutting it and welding the end of it shut.
jperecko
Diesel Ape
I think the best way to go about this would be to use a glow plug... as the plug... just chop the tip off and maybe bore the middle a little bit. That way there is no doubt that it is threaded and seated properly. Then take the junk you cut/broke off and put it in a graduated cylinder and measure the displacement. Then some maths!
argve
Resident Fruitcake
mount the grid heaters under the turbo hat.
ameristar1
The One Blue Thing
How hot do the glowplugs get? Is it like 500 degrees or more?
jperecko
Diesel Ape
It is not the temperature of a specific point which matter, it is the overall energy put into the system which does. Just because the tip of the glowplug hits 1000F(I think it is around there) does not mean much. If you are shooting for a grid heater design, I would work to create a system which draws about the same amount or more energy than the glow plugs.
ameristar1
The One Blue Thing
1320Cummins brought it up in the "idi's for medium duty's" thread, and the glowplugs in his S1600 don't work. I mean it would be a pretty quick way to drop the compression a little.
Think it might be enough to drop it 1-1.5 points?
I'll toss an idea out. Drill the intake manifold front to back in the middle of the runners on each side and install some heating elements.
Think it might be enough to drop it 1-1.5 points?
I'll toss an idea out. Drill the intake manifold front to back in the middle of the runners on each side and install some heating elements.
jperecko
Diesel Ape
They are square-ish about 3" by 3" with contact posts on the side. Check ebay for pictures. You would have to do a little work to make them work on an IDI but anything is possible.
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