decreasing compression ratio in 3B (1 Viewer)

[Dougal]

I thought you were on a budget? You are speculating about larger plungers in your nippondenso pump? My guess (I actually don't intend to offend you, but) if you are unfamilar with the differences between IDI and DI pistons and liner protrusion then I am going to take a guess that you may be over your head in changing plungers in an inline pump or retrofiting a mechanical governor Isuzu pump onto a pneumatic governor Toyota engine. My recommendation if you just want a reliable motor and are on a budget of any sort is that you:
1. Remove pan of junkyard motor
2. Remove and replace bearings. Or if you have confidence in your bearing analysis decision making, clean, slather in Lubriplate 105, re-install
3. replace pump diaphragm
4. replace any other suspect gaskets, pilot bearing
5. inspect turbo fins, shaft play
6. re-install motor
Anything beyond this is experimenting and may or may not lead to frustration, stamping of feet and gnashing of teeth. Do not attempt to lower compression ratio, you (I believe) are not trying to build a 100psi compound turbo racing motor.

Gerg is way past all of that and has done all his homework to boot. The reason for compression ratio reduction is simple, He's running compound turbos with more boost than anyone has put on a 3B before.

Everyone is on a budget, old injector pumps aren't expensive.

 

[nate dogg]

I thought this was slammed41's project? No?

 

[Dougal]

I thought this was slammed41's project? No?

Oh yeah was too. Kind of got hijacked.

 

[gerg]

Thanks for the kind words Nate. Ill do a bit more reading. And yes I am experimenting.
Cheers
g

 

[slammed41]

ha!

nate dogg, no offence taken...thanks for the advice and for reeling the thread back in! you're absolutely correct...i am on a relative budget and i plan to do what both you and crushers have suggested.

meanwhile, i was very curious about what dougal mentioned re: larger plungers in the pump. i don't plan to do such a modification to mine as it is obviously unnecessary to my application, but i am keen to learn what others have been doing or plan to do to their 3B engines.

thanks to all for the 4 page journey!

peace...out,

r