m-tdi / m-hdi conversion

[BEALEY]

just done mtdi conversion on my 110 HDI because of some major ecu faults and its come out ok im pleased to say apart from a few revving problems which i know why im having these problems and turbo working overtime and blowing pipes off lol but heres a video of her running its not brilliant but its work in progress i will post some more pics up later of us doing the conversion when i get camera sorted

http://www.youtube.com/watch?v=IWv_GdcpG9A&feature=plcp

[lozz]

excellent

so will that run on cooking oil now its converted?

[Bailes1992]

Can't run cooking oil on direct injection engines as it will gum and wear the piston rings.
What injectors are you using?
How does the BSI Cope with this?

Bailes.

[BEALEY]

seems to be fine there some injectors a diesel engineer near me had that the tips have been changed to work with the hdi block engine so spray pattern etc same only problem is shes only running a 9mm head/plunger so she as no torque atm. i am going to change to 11mm or bigger so that issues sorted but other than that and a small fueling issue after 3500rpm which im going to sort tomorrow shes ok lol and im going to run veg oil anyway its cheeper and i have friends that have di's and thay are running fine on it atm and have been for a long wile plus its cheeper lol

[lozz]

Hdi & xud is same block, so shouid have same pistons, iwouid of thought,
theres reference to this on here and other forums, there was a topic on it while ago, the main point of it was to enable a Hdi to run on Veg oil,

Good luck mate ihope everything goes well and becomes the first Veg powerd hdi

[Bailes1992]

Pistons between the HDi and XUD are totally different.
The HDi is designed to have high pressure fuel injected onto the surface of the piston. The XUD has a prechamber and fuel is injected elsewhere first.

Also a 9mm head should be more than enough for the HDi. You turned the fueling up? Timing correct? Boost compensator adjusted ok?
I was running 22psi of boost on my XUD and 9mm head was more than adequate. Was bloody fast too! 0-60 in sub 10s.

[BEALEY]

thanks lozz i will keep this thread updated lol. the xud and hdi blocks are different though things that i know are same are the conrods not sure bout anything else i have had to run the hdi pump bracket because of the holes in the block been different but with a few modifications to the bracket the pumps mounted and ive had to do the timming by eye and past experience with dturbos and xud in general because thay was obviously no timming pins in the hdi bracket to time the pump up lol

[BEALEY]

ive done all pump modifications that i can do with the bosch pump up to now fuels turned up etc. timming seems to be ok but i will re check this but i have been told by a diesel pump specialist near me that the 9mm plunger wont supply as much fuel as the di needs but it will run it and drive lol so it needs to be uprated. boost is off the boost gauge and keeps blowing boost pipes but nothings plain sailing and i expected problems lol

[ally406]

Sorry, big n00b question.....what is m-tdi?? Looks interesting.

I would avoid veg in a direct injection. They will run ok for a while, but it's a matter of time before the rings gum. If you think of the edges of an old frying pan, vegetable oil polymerises at high temperatures when it isn't fully burned. So in a cold engine, this stuff forms on the rings and gums them. Not much of a problem in an IDI engine as the uncombusted fuel doesn't reach the rings, it's in a seperate chamber. This is why it really is essential that you twin tank a DI engine if you plan to keep it.

On the subject of conrods, I was reading Darren Lobb's blog. He swapped the conrods from an HDI into an XUD. They are the same physical fit, but much stronger allowing for bigger power.

[ianjoh]

You have said that the turbo keeps blowing the pipes off, is this because it is running unregulated or have you changed it for a mechanical wastegate type? Great project!

[Bailes1992]

M-TDi is when you fit a mechanical pump like an XUD onto a HDi lump.
I have a VE pump sat here just incase I had to do it to my 406.

[BEALEY]

a few pics of us doing conversion

riped a few bits off engine starting with ecu wich when it goes back on it will only be running as a bcu or body controll unit





injectors and fuel rail


hdi pump removed and bracket removed so i we could bodgeyfiey the pump bracket to fit ve pump because it was a farse messing with the dturbo bracket the bodgeing wasnt easy lol but it works


ve pump ready


pump mounted on engine


belt on and timmed up


delivery valves removed to acommodate better reconditioned ones


reconditioned valves


injectors in injector lines in pump on timmed no fuel lines



fuel lines made inline filter on



all back together


smoke on first startup dident get a vid didnt have time

[BEALEY]

and shes on bio diesel and veg and diesel mix and has been for the last 1000 miles and hasent missed a beat

[BEALEY]

ive taken her off the road for the time being to fit a better fmic and do some pump work and fitting a large turbo wich i am giong to run bi turbo wich means small turbo boosting bigger turbo for those who dont know what bi turbo means. the pump is having bigger head/plunger in for alot more fueling and im doing a few more things to the pump internaly e.g. gov mod lda pin etc. when she goes back on the road the first journey will be to a rolling road im going to pay for a few runs and see what i can get out of her and do a few modifications wile im there to get the best out of the engine and work i will have done i will keep updating progress is i go along. i cant take all the credit to the conversion as one of my best mates tom has been helping me all the way removeing and fitting parts with me

[KrisB]

Have you seen Darren J Lobbs Mhdi turbo supercharged beast thing? lol



Sorry if it's a large pic, most forums resize nowadays....