Turbo's on IDI'S WHY?????
Diesel Wrench
Joined: Nov 2009
Posts: 540
Likes: 26
From: Michigan
To the OP, more performance and better fuel economy.
Same compression ratio, just not much boost.
Same compression ratio, just not much boost.
Diesel Bomber
Joined: Jun 2010
Posts: 3,202
Likes: 143
From: Tacoma
the only reason cummins and the other diesel engine manufacturer's are using big boost numbers is due to the huge quench area in the piston.... therefore if you attemt to run a 12v or 24v with out the turbo... you would have crap for power ... there comp. ratio minus turbo input (Dry/with out fuel) 12v/24v is like 15:1 which is called static cmpression (means without influence... ie boost) , when you add the extra atmospheric pressure from the turbo you end up with higher pressure, as if you had more comp ratio .. ending in the 21:1 area....
on the other hand our IDI's have like 18-20:1 comp ratio so there is less quench ( big bowl in piston) so by adding boost you are infact over pressuring the cylinder a bit.... thats why if your gonna go turbo ( more that 3-6 psi ) you should get some pistons that will handle the extra pressure as well...... if you just stud the heads and new gaskets... its still a ticking time bomb.... if you over due it.... 3-7 psi is normal in the turbo motors due to the quench in that peticular models they were made for that amount of boost.... but you can get away with a lil more ... just dont get retarded and try for like 25 psi... you will find your heads in your hood....
in all turbos just make an engine more efficient....unless the builder never intended the engine for extra added cyl pressure... then ticking time bomb...
on the other hand our IDI's have like 18-20:1 comp ratio so there is less quench ( big bowl in piston) so by adding boost you are infact over pressuring the cylinder a bit.... thats why if your gonna go turbo ( more that 3-6 psi ) you should get some pistons that will handle the extra pressure as well...... if you just stud the heads and new gaskets... its still a ticking time bomb.... if you over due it.... 3-7 psi is normal in the turbo motors due to the quench in that peticular models they were made for that amount of boost.... but you can get away with a lil more ... just dont get retarded and try for like 25 psi... you will find your heads in your hood....
in all turbos just make an engine more efficient....unless the builder never intended the engine for extra added cyl pressure... then ticking time bomb...
Last edited by 4x4manonbroke; Apr 24, 2012 at 08:48 AM.
Diesel Enthusiast
Joined: Mar 2012
Posts: 131
Likes: 18
From: Shitensburg Pa
the only reason cummins and the other diesel engine manufacturer's are using big boost numbers is due to the huge quench area in the piston.... therefore if you attemt to run a 12v or 24v with out the turbo... you would have crap for power ... there comp. ratio minus turbo input (Dry/with out fuel) 12v/24v is like 15:1 which is called static cmpression (means without influence... ie boost) , when you add the extra atmospheric pressure from the turbo you end up with higher pressure, as if you had more comp ratio .. ending in the 21:1 area....
on the other hand our IDI's have like 18-20:1 comp ratio so there is less quench ( big bowl in piston) so by adding boost you are infact over pressuring the cylinder a bit.... thats why if your gonna go turbo ( more that 3-6 psi ) you should get some pistons that will handle the extra pressure as well...... if you just stud the heads and new gaskets... its still a ticking time bomb.... if you over due it.... 3-7 psi is normal in the turbo motors due to the quench in that peticular models they were made for that amount of boost.... but you can get away with a lil more ... just dont get retarded and try for like 25 psi... you will find your heads in your hood....
in all turbos just make an engine more efficient....unless the builder never intended the engine for extra added cyl pressure... then ticking time bomb...
on the other hand our IDI's have like 18-20:1 comp ratio so there is less quench ( big bowl in piston) so by adding boost you are infact over pressuring the cylinder a bit.... thats why if your gonna go turbo ( more that 3-6 psi ) you should get some pistons that will handle the extra pressure as well...... if you just stud the heads and new gaskets... its still a ticking time bomb.... if you over due it.... 3-7 psi is normal in the turbo motors due to the quench in that peticular models they were made for that amount of boost.... but you can get away with a lil more ... just dont get retarded and try for like 25 psi... you will find your heads in your hood....
in all turbos just make an engine more efficient....unless the builder never intended the engine for extra added cyl pressure... then ticking time bomb...
the only reason cummins and the other diesel engine manufacturer's are using big boost numbers is due to the huge quench area in the piston.... therefore if you attemt to run a 12v or 24v with out the turbo... you would have crap for power ... there comp. ratio minus turbo input (Dry/with out fuel) 12v/24v is like 15:1 which is called static cmpression (means without influence... ie boost) , when you add the extra atmospheric pressure from the turbo you end up with higher pressure, as if you had more comp ratio .. ending in the 21:1 area....
on the other hand our IDI's have like 18-20:1 comp ratio so there is less quench ( big bowl in piston) so by adding boost you are infact over pressuring the cylinder a bit.... thats why if your gonna go turbo ( more that 3-6 psi ) you should get some pistons that will handle the extra pressure as well...... if you just stud the heads and new gaskets... its still a ticking time bomb.... if you over due it.... 3-7 psi is normal in the turbo motors due to the quench in that peticular models they were made for that amount of boost.... but you can get away with a lil more ... just dont get retarded and try for like 25 psi... you will find your heads in your hood....
in all turbos just make an engine more efficient....unless the builder never intended the engine for extra added cyl pressure... then ticking time bomb...
on the other hand our IDI's have like 18-20:1 comp ratio so there is less quench ( big bowl in piston) so by adding boost you are infact over pressuring the cylinder a bit.... thats why if your gonna go turbo ( more that 3-6 psi ) you should get some pistons that will handle the extra pressure as well...... if you just stud the heads and new gaskets... its still a ticking time bomb.... if you over due it.... 3-7 psi is normal in the turbo motors due to the quench in that peticular models they were made for that amount of boost.... but you can get away with a lil more ... just dont get retarded and try for like 25 psi... you will find your heads in your hood....
in all turbos just make an engine more efficient....unless the builder never intended the engine for extra added cyl pressure... then ticking time bomb...
Banned
Joined: Mar 2012
Posts: 121
Likes: 10
Right. In IDI engines the "bowl" is in the cylinder head, a far worse place.
Whats sad is the first gen 5.9 Cummins needs 18psi of boost to make 15hp less than the non-turbo 7.3IDI and only 15lb/ft more torque.
Whats sad is the first gen 5.9 Cummins needs 18psi of boost to make 15hp less than the non-turbo 7.3IDI and only 15lb/ft more torque.
