Just another "impossible" build
Lead Driver
Joined: Jan 2006
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Decompressing the engine allows for more aggressive turbo pressure. When you turbo charge the engine you increase compression by forcing air into the cylinder before it compresses the air. Adding a turbo to a High compression diesel engine Like the IDI you create to much supper heated air pre combustion and this makes for High EGT's at lower fuel levels before you add more fuel to increase power. Balancing the compression to the turbo makes for better performing engine at higher power (Fuel) levels.
Like on a direct injected diesel, you lower compression, and the injector is still spraying fuel into the air.
In the IDI, if the combustion is reduced, the spray isn't injected into all the air, only the air in the pre-chamber or swirl chamber. Is it just that it exits the chamber and then finishes burning once mixing with the rest of the air?
Senior User
Joined: Feb 2012
Posts: 445
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From: western Oregon
The pre cup is where the fuel starts burning yes...Then the jet of burning fuel shoots out and is deflected into the recardo cups by the curved depression in the top of the piston where it finishes the combustion of the fuel in a larger area on top of the piston. Cooler air in the combustion area expands more and holds more oxygen so it releases more power. That's why intercoolers make more power and reduce EGT's.
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Senior User
Joined: Jun 2012
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A little update, my clutch and fuel sender got here today, so tonight I'm going to pick up my transmission, and Sunday going to the jy to get the transmission tunnel and pedal assembly. Then this week hopefully I can get a transmission in and driveshafts made.
On another note the turbo should be here tomorrow, and I have to wait till I get the tranny in to make my piping. Do any of you know of a good 3" builders kit, I'm thinking steel so I can weld it here at home. I don't have a reliable source for rig welding close to home.
On another note the turbo should be here tomorrow, and I have to wait till I get the tranny in to make my piping. Do any of you know of a good 3" builders kit, I'm thinking steel so I can weld it here at home. I don't have a reliable source for rig welding close to home.
Posting Guru
Joined: Sep 2011
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Here is the place 91dirty used for his intercooler piping.
http://www.mandrel-bends.com/catalog...851f36cbb95ce0
http://www.mandrel-bends.com/catalog...851f36cbb95ce0
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Senior User
Joined: Jun 2012
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Here is the place 91dirty used for his intercooler piping.
http://www.mandrel-bends.com/catalog...851f36cbb95ce0
http://www.mandrel-bends.com/catalog...851f36cbb95ce0
Fleet Mechanic
Joined: May 2013
Posts: 1,256
Likes: 4
From: NC
Only problem I see is the transfer case behind the ZF6 doesn't have a speedometer gear, its electronic, and iirc Diesel Brad ran into the same issue, and said you can't mount the old transfer case on the new tranny atleast without some work. a 92-up speedo picks it off a VSS sensor on the rear axle, where the pre 92- use a cable. Not trying discourage you Austin, just trying to help.
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Lead Driver
Joined: Apr 2008
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Only problem I see is the transfer case behind the ZF6 doesn't have a speedometer gear, its electronic, and iirc Diesel Brad ran into the same issue, and said you can't mount the old transfer case on the new tranny atleast without some work. a 92-up speedo picks it off a VSS sensor on the rear axle, where the pre 92- use a cable. Not trying discourage you Austin, just trying to help.
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Senior User
Joined: Jun 2012
Posts: 282
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Only problem I see is the transfer case behind the ZF6 doesn't have a speedometer gear, its electronic, and iirc Diesel Brad ran into the same issue, and said you can't mount the old transfer case on the new tranny atleast without some work. a 92-up speedo picks it off a VSS sensor on the rear axle, where the pre 92- use a cable. Not trying discourage you Austin, just trying to help.
This is one of the higher end units http://www.abbott-tach.com/cablex.htm
Senior User
Joined: Oct 2006
Posts: 186
Likes: 1
With glow plugs. I may even cycle them 2 or even 3 times if very cold and I am caught unprepared and don't have it plugged in. I normally use an oil pan heater pad w/ the stock block heater, but have tested it down to -25 w/glow plug assist. No way w/out properly functioning glow plugs.
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Joined: Jun 2012
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I am getting my zf Wednesday or Thursday. Ended up finding one 8 hours away near St Louis, but it just so happens that my uncle lives 15 minutes from there and is coming up for thanksgiving! So it all worked out and he is leaving illinois Wednesday morning.
That being said I want the transmission in before I start on building my turbo kit, because the drivers side manifold is crossing over the transmission bellhouse. I would go in front of the motor but I just don't see how Racin crammed it up there! And I don't see why the way I'm doing it won't work. I think all I need to order is some 3" mild steel bends, boots, a t4 flange and clamps! I can't wait to hear her whistle for the first time ever!
That being said I want the transmission in before I start on building my turbo kit, because the drivers side manifold is crossing over the transmission bellhouse. I would go in front of the motor but I just don't see how Racin crammed it up there! And I don't see why the way I'm doing it won't work. I think all I need to order is some 3" mild steel bends, boots, a t4 flange and clamps! I can't wait to hear her whistle for the first time ever!