gas vs diesel turbos

[Nemesis Gnat]

sorry for the inexperience, but tell me where my logic is wrong here...

would it be possible to turbo the 2f, run it like that for a while, then switch to a 2h and run the same turbo on the diesel motor?

i figure theyre similar sized engines with similar powerbands, so theyd use a similar turbo... right?

 

[fliphkd778]

I don't see why not, while one turbo might not be the absolute best for either...
If I'm not mistaken, diesels run at many more pounds of boost, whereas a stock 2f wouldn't handle the same amount. You could possibly run a diesel turbo with a beefy wastegate to let off the excess. Then when you go diesel, you could run with less boost bled off

 

[cody c]

similar power bands?
diesels should be making the power down low, with a peak around 2200 rpm and starting to spool up at 1200, gassers have alot more room in the top end. The turbo i have on my 3.4 litre 3B is off of a 2.3 litre car and is a little on the big side for my cruiser.
sorry.

 

[roscoFJ73]

Safari turbos in oz use to make a kit for the F engine many years ago. There is still one old guy around who has one but they didnt seem to be long lasting.

 

[Nemesis Gnat]

i guess i havent actually seen a 2h and 2f dyno chart right next to eachother, but as far as i know they make about the same power and torque at about the same rpms and i hear they drive similar to eachother... could be wrong

the boost levels thing also occured to me, and i had the same bov/wastegate idea... but me not smart in the ways of motors

guess more research is in order...

 

[cruiser_guy]

Turbo's do not cross over solely based on engine displacement. The diesel of a similar displacement needs more air than a gasser because of the lower RPM. Like "cody c" says, a turbo from a smaller gasser seems to work better on a diesel. About 2/3 the size (turbo from a 2 liter gasser on a 3 liter diesel) seems to be relatively close.

 

[cody c]

there is actually a compatability equation somewhere, something like displacement X rpm for max boost X a constant number. this kind of tells you a ballpark equivalent.

 

[rchalmers3]

Turbo's do not cross over based on engine displacement. The diesel of a similar displacement needs more air than a gasser at the same RPM due to the higher compression. Like "cody c" says, a turbo from a smaller gasser seems to work better on a diesel. About 2/3 the size (turbo from a 2 liter gasser on a 3 liter diesel) seems to be relatively close.

Cruiser_guy,

Here's my understanding: Bore x stroke x RPM = total air volume. The RPM range of the motor is as important to sizing the turbo as the displacement.

It is the relative speed of the different engines that creates the disparity in turbo sizing, not the compression.

If the 2F and 2H have:
1) the same displacement
2) turn the same maximum revs
3)and share similar volumetric efficiencies

Then the same sized turbo can be used on both.

The reason smaller gasser turbos can be used on the larger diesels is that the gasser motors wind faster, thus increasing the air volume through the motor.

Here is a link to a wonderful tool for calculating the turbo sizing: http://www.not2fast.com/turbo/glossary/turbo_calc.shtml

Hope this helps.

Rick

 

[cruiser_guy]

Here's my understanding: Bore x stroke x RPM = total air volume. The RPM range of the motor is as important to sizing the turbo as the displacement.

Sorry, my bad.