Bosch K-jetronic - How to: Modify Your Metering Head

[@1.6Kilometres]

Righto. I’m going to give this a go on my 81 Volvo B23e. Going to make my Grandad proud.

[@jasonbarron9585]

Not sure why in all my research into K-Jet I've never stumbled across your content. It is excellent, really informative and helps to validate all the reading I've done. I've rebuilt the metering head and WUR (16v variety) on my Mk1, and got it running pretty well. When you are doing your volume tests, are you running your rig with a 'warm' WUR, and what position do you have the air metering plate? Haynes manual for the Mk1 doesn't give per injector volume figures, just says to run until you get 100ml and the others should be within a certain % tolerance. Do you know if there are specified per minute volumes published for the Mk1? Sorry, few questions in there! Keep up the great work.

[@GreyGooseRestorations]

Hi, I use a power supply to simulate a warm environment. Minimum fuel is 120cc/min per injector with the plate lifted 25mm from rest and 20cc/min with the plate at 2mm lift Ideally you want zero imbalance across the number of injectors

[@jasonbarron9585]

@@GreyGooseRestorations brilliant, thanks for the reply, time for some tinkering I think!

[@volvotommi]

one of my metering heads injector port starts to give fuel sooner than others. non adjustable head. is shimming the spring way to go? i have also metering head from bmw with adjustment screws. it also was too anxious to start spraying. i have to build bench. do you use diesel as test fluid?

[@GreyGooseRestorations]

Yes with the non adjustable ones it's a case of shimming the spring internally, no I use a specific calibration fluid for petrol based units

[@1.6Kilometres]

Do you soda blast the iron fuel distributors to clean the rust off the outside?

[@GreyGooseRestorations]

No I do these by hand and then they are bathed in ultrasonic cleaner, to much risk of blocking the control port with any media

[@caseytattersall814]

Hi would the shim modification work on a mk1 golf gti ? And do you need fuel pressure gauge, (havent got one to see p.s I) and how many shims would you recommend without using fuel gauge ,is it best to a pressure gauge? And also would the W.U.R modification work looks slighty different , awesome videos thanks for any help 👍

[@GreyGooseRestorations]

You ideally need a set of pressure guages to see whats its going first before upping the pressure. The WUR modification in principle is the same with lowering the control pressure

[@caseytattersall814]

Ok thanks for your help😃 👍

[@BrorAppelsin]

Your videos make me feel like I should grab my spare metering head and start fiddling with it...

[@GreyGooseRestorations]

Do it 👍

[@heribertmueller9613]

Ingenious idea. Thank you so much for sharing such knowledge.

[@hadlowwww]

Really useful video, thanks! Curious as to what you use instead of fuel? Last video you said it helps clean and isnt flammable

[@GreyGooseRestorations]

Thanks, i use 80/20 approx mix of fuel and jizzer cleaning fluid

[@bedo953]

Hello! could you tell me an approximate value of the amount of fuel for a Kr engine? for example, how many deciliters should there be in 1 minute at full throttle?

[@GreyGooseRestorations]

Book figures state 120 cc/min (1.2 deciliters) when rebuilding and flow testing metering head for 16v KR i set them at 140 cc/min (1.4 deciliters)

[@bedo953]

@@GreyGooseRestorations Thanks

[@MatthewCoxall-d4s]

You have really helped me understand how my KR works. I’d still worry about splitting that metering head though! By increasing fueling as you do is MPG dramatically reduced?

[@GreyGooseRestorations]

Thanks, not much to be honest, obviously full throttle applications will use more but if all else is well and set to optimum for the engine you won't notice much

[@sergeilosev1416]

whats different beetwen KR/9A engines

[@GreyGooseRestorations]

KR is 1781cc (1.8ltr) and the 9a is a 1984cc (2.0ltr)

[@mcfly6667]

Garage light must be CIS-E ...

[@GreyGooseRestorations]

😅

[@predraglukovic7733]

What a genius👍

[@GreyGooseRestorations]

Thanks

[@ramarakeshv]

Fantastic mate

[@GreyGooseRestorations]

Thanks