Aussie80inch Posted February 5, 2015 Share Posted February 5, 2015 Until I do the 200tdi engine swap in my 80 inch I want to squeeze a wee bit more power from the old 2.25 diesel motor. Background on the motor is it was recondition 20ks ago, piston and rings, bearing , head reco etc etc. Has anyone done LPG to there 2.25D apparently it gives you more power but not the strain of a turbo Here's what I was thinking in the interim ( 200tdi swap ) Extractors and a good 2 -3/4 inch free flow exhaust Maybe gas flow the head Tweak the fuel pump along with checking the injectors Swapping to a high end synthetic oil LPG fluff system to the air intake All and any help is always appreciated Quote Link to comment Share on other sites More sharing options...
Snagger Posted February 5, 2015 Share Posted February 5, 2015 That's a lot of work and expense for a short term engine. Propane injection works well on HGVs, but it needs careful metering, and the increased torque will still strain the crank - I wouldn't do it on a 3mb crank engine. Frankly, though, you're better off spending the money on a Tdi, which will give better performance, fuel economy and (assuming you refurbish it to the same standard as the 2.25) better reliability. Just don't use 3.54 diffs and overdrive together, how ever tempting it may seem. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted February 5, 2015 Share Posted February 5, 2015 If you had the engine done 20k's ago, then it won't get much better. Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted February 5, 2015 Share Posted February 5, 2015 Until I do the 200tdi engine swap in my 80 inch I want to squeeze a wee bit more power from the old 2.25 diesel motor. Background on the motor is it was recondition 20ks ago, piston and rings, bearing , head reco etc etc. Has anyone done LPG to there 2.25D apparently it gives you more power but not the strain of a turbo Here's what I was thinking in the interim ( 200tdi swap ) Extractors and a good 2 -3/4 inch free flow exhaust Maybe gas flow the head Tweak the fuel pump along with checking the injectors Swapping to a high end synthetic oil LPG fluff system to the air intake All and any help is always appreciated If you have the money and the time, go for it. But then if you have the money and the time, why wait on the Tdi swap? Personally I think you'll see such a small gain that it just won't be worth it. Ok it might pep it up, but even if you gained 10hp, you still have an engine that is woefully underpowered. Which I suspect after a few miles will feel like you did almost nothing to it and you'd still be wanting more. That said, if you mod the exhaust now, you could make it so it's useful for the Tdi swap. LPG I'm sure will give you something, but like I say, I think the total gains and your total HP will still be too low. Thin modern oil is more likely to leak from these old engines. I'd stick with the thick mineral stuff myself. If you are running a factory rod throttle linkage, you may want to fettle with that or convert to cable. Many stock diesel Series never actually saw wide open throttle (even if the pedal moved to the floor), due to the slop and setup of the rod linkages. Quite easy to get full pedal travel, but say only 80% throttle at the engine. Quote Link to comment Share on other sites More sharing options...
elbekko Posted February 5, 2015 Share Posted February 5, 2015 Something like LPG injection isn't wasted when the TDi is eventually swapped in though. Is it legal to do in the UK? Quote Link to comment Share on other sites More sharing options...
tacr2man Posted February 5, 2015 Share Posted February 5, 2015 In a nutshell your flogging a dead horse with a 2.25 , i tried a few things about 40 years ago , the only thing that worked was throwing it out and fitting a 3.8 L leyland diesel . Quote Link to comment Share on other sites More sharing options...
robertspark Posted February 5, 2015 Share Posted February 5, 2015 ...no replacement for displacement (except maybe some forced induction to a degree)... Save your cash for your upgrades and mods required then. Small power gains on a heavy vehicle and old engine design are IMHO pointless especially if you have an endgame in mind Quote Link to comment Share on other sites More sharing options...
bushwhacker Posted February 5, 2015 Share Posted February 5, 2015 Hi there. I had asked a very similar question with reference to my 2.5 na in my 110. I got good advice on how to boost it up, but guess what why waste the time and money. I'll just live with it for a few more weeks and do 300 tdi swop. jmho. Quote Link to comment Share on other sites More sharing options...
need4speed Posted February 5, 2015 Share Posted February 5, 2015 Dont try to polish a turd... Put the slightly less turdy engine in and have done with it..... Quote Link to comment Share on other sites More sharing options...
wood-gee Posted February 5, 2015 Share Posted February 5, 2015 I hope you don't mind me chipping in, but this is a question for Snagger based on his comment; would you mind expanding on what you meant by Just don't use 3.54 diffs and overdrive together, how ever tempting it may seem. Is this because the overdrive would see too much torque? Quote Link to comment Share on other sites More sharing options...
ejparrott Posted February 5, 2015 Share Posted February 5, 2015 Nick and I have have very different views on it. I have OD and 3.54 diffs in my 88 no problems at all, I find the gearing to be perfect with 3rd+OD giving me an excellent 30mph in town. We've settled on the fact that's mines an 88 and half a ton lighter than his 109. He's looking for some 4.1 diffs Quote Link to comment Share on other sites More sharing options...
robertspark Posted February 5, 2015 Share Posted February 5, 2015 ....what about pegging the diff? ...phosphor bronze slipper / back plate and some retention bolts? Quote Link to comment Share on other sites More sharing options...
wood-gee Posted February 5, 2015 Share Posted February 5, 2015 Ah OK, I wasn't sure if it was a kind of accepted fact that it's bad practice, so it's a relief to hear that I haven't been breaking such a rule having 3.54 diffs and OD myself, although similar to you, mines an 88'' truck cab, so about as light as you'll get. Quote Link to comment Share on other sites More sharing options...
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