pugbus now going 'M'HDI
Moderator: RichardW
pugbus now going 'M'HDI
Hi I've been running and converting VW campers to pug power for over twenty years , and have now decided to rebuild a HDi engine to my specification ,
Will be looking to upgrade to larger turbo , one from a Boxer/Relay HDi , by the look of these they appear slightly larger - does anyone know the difference + what RPM the turbo kicks in at between different turbo's ? Other option is to go VNT
machined some injectors to work with a unique pump and support bracket that I build ,
back in a short while in the mean time here's a pic
Will be looking to upgrade to larger turbo , one from a Boxer/Relay HDi , by the look of these they appear slightly larger - does anyone know the difference + what RPM the turbo kicks in at between different turbo's ? Other option is to go VNT
machined some injectors to work with a unique pump and support bracket that I build ,
back in a short while in the mean time here's a pic
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Hold on, an HDi is a DI engine and the VP20 pump you have there is expressly designed to work with IDI pintle injectors at a relatively low pressure compared to that used with DI multi-hole injectors.
This is rater interesting Are you using pintle-type injectors in a DI engine or have you done something else?
I'm on the edge of my seat here! Please do tell!
This is rater interesting Are you using pintle-type injectors in a DI engine or have you done something else?
I'm on the edge of my seat here! Please do tell!
Jim
Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
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Hi, The pump started life as an IDI but to look at it it looks just like a di pump from a Kia sedona + rover 200 ,
I've built this pump to a similar internal spec to the mechanically operated VAG TDi 115bhp pumps that I build , so has a much steeper camplate , larger distributor and head , governor from a normally aspirated to give extra 500rpm , different parts to change advance curve , plus a number of other modifications making it unique to this engine with working pressure above 300 Barr
Injectors are from a direct injection turbo engine , I searched through many types of injectors , problem being the ones that fit best were only single stage ( meaning more stress and sounding like an old transit Di )
I then found some injectors with 5 hole nozzles that worked two stage 220-300 Barr , I had these machined so they'd fit into the HDi
Engine to start with is a DW10 , 2.0 Litre but thinking to fitting a 2.2HDi ?? at a later date
starter bolts onto one of my adaptor plates at the front of the engine as it would be on the PSA gearbox
The VW TDi engines that the bus guys use aren't common rail , they have a Bosch VE37 pump that's operated by ECU same idea as the last 406 2.1 td's ( Lucas )
- A lot using Land Rover TDi pumps on VAG TDi's but not the best LOL!!
I've built this pump to a similar internal spec to the mechanically operated VAG TDi 115bhp pumps that I build , so has a much steeper camplate , larger distributor and head , governor from a normally aspirated to give extra 500rpm , different parts to change advance curve , plus a number of other modifications making it unique to this engine with working pressure above 300 Barr
Injectors are from a direct injection turbo engine , I searched through many types of injectors , problem being the ones that fit best were only single stage ( meaning more stress and sounding like an old transit Di )
I then found some injectors with 5 hole nozzles that worked two stage 220-300 Barr , I had these machined so they'd fit into the HDi
Engine to start with is a DW10 , 2.0 Litre but thinking to fitting a 2.2HDi ?? at a later date
starter bolts onto one of my adaptor plates at the front of the engine as it would be on the PSA gearbox
The VW TDi engines that the bus guys use aren't common rail , they have a Bosch VE37 pump that's operated by ECU same idea as the last 406 2.1 td's ( Lucas )
- A lot using Land Rover TDi pumps on VAG TDi's but not the best LOL!!
Last edited by pugbus on 26 Jun 2010, 21:53, edited 1 time in total.
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Re: pugbus now going 'M'HDI
that is interesting. I'm betting that they are VW TDI injectors as they are a DI and known to work with a VP pump.pugbus wrote:machined some injectors to work with a unique pump
Is the original engine a common rail? I suppose there's no reason why you can't get low pressure DI injectors to work in a common rail engine if you can get them to physically fit.
Hi, the VW TDi injectors are to large a diameter just after the nozzle fixing ,meaning the first 16mm is the same at 16.90mm , the hdi head would require opening up 3.04mm to a depth of 46mm? from what I can remember , there are others that will fit but require different nozzles or more sealing washers . some late transit ones have a clamping collar that would just require the hdi injec holes threading to fit - less chance of copper seals failing
yes the engine I'm building was a common rail ,local breakers I know well have these in with no injectors or high pres pumps - so can be bought cheap , the lower pressure Di injectors will work just the same as in other TDi type engines , had the engine turning over and two injectors working , so looks as though I'll have to strip the other two down to clean them
yes the engine I'm building was a common rail ,local breakers I know well have these in with no injectors or high pres pumps - so can be bought cheap , the lower pressure Di injectors will work just the same as in other TDi type engines , had the engine turning over and two injectors working , so looks as though I'll have to strip the other two down to clean them
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This is where the problem is as I've found two that are faulty , I got them from a diesel fitters mate after searching through boxes of injectors and you've guessed it there was no indication on the box to say what there from ,( they have a machined grove like transit/bmw ones for the clamping collar but when checked the part number didn't match up ) so I'll have to search the part numbers another way to see what comes up ,
for the injectors that aren't working it looks like I'll have to strip them down to put in the ultrasonic cleaner then recheck - if no good will replace the nozzles , I was hoping to have had it running today but was called out
for the injectors that aren't working it looks like I'll have to strip them down to put in the ultrasonic cleaner then recheck - if no good will replace the nozzles , I was hoping to have had it running today but was called out
yes nearly had a serious accident removing stuck injectors once , uncoupled the pipe to one then started the engine ( should have placed an old coat over engine ) put it this way it went with an almighty bang and the injector took some finding
anyone know if 2.0hdi head will fit a 2.2hdi , suppose a check of head gaskets would answer this ?
anyone know if 2.0hdi head will fit a 2.2hdi , suppose a check of head gaskets would answer this ?
Got another set of injectors machined , Set timing up to the book for a tdi , bled injectors and this is the first start up , I'm really pleased at how she sounds , sits nice and steady , just need to fit new fuel injector pipes , pos variable vain turbo or twin turbo , then adaptor plate to fit my camper , check out this video