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4JH1 Mechanical Pump Conversion Kit

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4JH1 Mechanical Pump Conversion Kit

Postby paulthepilot5 » Mon Jul 26, 2021 7:38 pm

Hi Everyone.

Have started fabricating pump adaptor kits to simplify conversion of the 4JH1 to mechanical 4JB1 injection pump.
This enables a mechanical conversion while retaining the factory JH1 timing gears and case.

Link to info page: https://www.facebook.com/10685759134064 ... 32091/?d=n

Cheers
Paul
paulthepilot5
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Compound twin Turbo
12mm fuel Pump
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14s 1/4 Mile

Re: 4JH1 Mechanical Pump Conversion Kit

Postby geeves » Tue Jul 27, 2021 8:20 am

Do these use the belt or gear version of the 4jb1 pump?
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 4JH1 Mechanical Pump Conversion Kit

Postby paulthepilot5 » Tue Jul 27, 2021 9:26 am

geeves wrote:Do these use the belt or gear version of the 4jb1 pump?

Only the gear drive variant
paulthepilot5
Isuzu Junior
 
Posts: 109
Joined: Thu Apr 05, 2018 8:56 pm
Age: 34
Country: Australia
City: Brisbane
Vehicle: 1995 Isuzu Rodeo 2.8d
Compound twin Turbo
12mm fuel Pump
+50 injectors
Water/meth injection
14s 1/4 Mile

Re: 4JH1 Mechanical Pump Conversion Kit

Postby mh1989 » Mon Aug 09, 2021 11:48 am

Nice one, what injector lines do you use?
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1992 Isuzu Rodeo 4jb1t

Re: 4JH1 Mechanical Pump Conversion Kit

Postby paulthepilot5 » Mon Aug 09, 2021 10:45 pm

mh1989 wrote:Nice one, what injector lines do you use?

Preferably the 4JB1 lines and injectors, they have the greatest power potential. 4JH1 Injectors can also be use as I have thread adaptors to convert the 12mm VE delivery valves to suit the 14mm JH1 injection lines. 4JH1 injectors will limit the potential of the mechanical pump a little but still very usable.
Cheers
Paul
paulthepilot5
Isuzu Junior
 
Posts: 109
Joined: Thu Apr 05, 2018 8:56 pm
Age: 34
Country: Australia
City: Brisbane
Vehicle: 1995 Isuzu Rodeo 2.8d
Compound twin Turbo
12mm fuel Pump
+50 injectors
Water/meth injection
14s 1/4 Mile

Re: 4JH1 Mechanical Pump Conversion Kit

Postby sparky109 » Wed Nov 10, 2021 5:27 pm

to convert a 4jh1 to mech pump can you fit 4jb1 gears and timeing cover lines and injectors etc will 4jb1 parts fit onto the front of the 4jh1 also what sort of electrical mods do you need to do tacho etc anybody done this thanks
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Re: 4JH1 Mechanical Pump Conversion Kit

Postby paulthepilot5 » Thu Nov 18, 2021 11:48 am

sparky109 wrote:to convert a 4jh1 to mech pump can you fit 4jb1 gears and timeing cover lines and injectors etc will 4jb1 parts fit onto the front of the 4jh1 also what sort of electrical mods do you need to do tacho etc anybody done this thanks
if you swap the whole lot over yes, but requires removal of the engine from vehicle to do so as sump also has to come off. Tacho reading is taken from flywheel rpm sensor, so not an issue with the mech pump.
paulthepilot5
Isuzu Junior
 
Posts: 109
Joined: Thu Apr 05, 2018 8:56 pm
Age: 34
Country: Australia
City: Brisbane
Vehicle: 1995 Isuzu Rodeo 2.8d
Compound twin Turbo
12mm fuel Pump
+50 injectors
Water/meth injection
14s 1/4 Mile


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