Pro's and con's of disconnecting the Volumetric Pump

RX MIDGET · 03-20-2011, 08:59 PM

Hi,
Every time I pop the bonnet something tells me the Volumetric Oil Pump set up is potentially a accident waiting to happen - ie, line coming off, dodgy wire wrapped at the carby end for adjustment, is it set correctly etc.

My question:
What are members thoughts on this? - and if they have choosen to remove the pump, what 2 stroke oil and mix ratio are you running?

I am not too concerned re the dramas at the bowser as I fill up from a drum at home....

Comments????

(13B Ext port / IDA 48)

FerociousP · 03-20-2011, 09:24 PM

People do it all the time, whether for assurance or when making power. I don't premix even with a slightly modified turbo II, but many people would.

Does your car sit for long periods of time? Loads of power? I'll let others and especially carb guys comment of type and amount... but really just any TC-w3 2-stroke specified.

dramas at the bowser = doing stuff at fillup at a gas pump?

PercentSevenC · 03-20-2011, 10:39 PM

Any TC-W3 rated oil should work just fine. I run Valvoline Multi-Purpose 2 Cycle since I can buy it by the gallon.

Most people recommend a 128:1 ratio, since that's an easy calculation in English units. I do a little extra since I'm boosted; typically it ends up being about 110:1.

RX MIDGET · 03-20-2011, 11:46 PM

Thanks guys,
Aussies have bowsers, not gas pumps.

Engine gets started usually weekly and holds minimal fuel in tank, so I dont mind fuelling up by hand.
Do those who run pre-mix usually remove the pump completly and fit a blank?

Any comments for someone who has completed this task????

FerociousP · 03-21-2011, 12:01 AM

Yes there are block off plates available, and just cap off where the lines go into the manifold.

It is as simple as it seems.

diabolical1 · 03-24-2011, 08:55 AM

you don't even have to go through the trouble of removing your MOP if you don't want to. i usually do both (premix with my MOP) and i feel somewhat justified since the only times i really do maintenance (cleaning) to my MOP is with rebuilds. i just pulled an engine i got last summer apart and i'm fairly sure a part of it's demise was that the MOP was unable to do it's job. premixing could have given it more service time - oh well, for a change, it's my gain now.

03-20-2011, 08:59 PM	#1
RX MIDGET MG rocket Join Date: Oct 2010 Location: Victoria Australia Posts: 40 Rep Power: 0	Pro's and con's of disconnecting the Volumetric Pump Hi, Every time I pop the bonnet something tells me the Volumetric Oil Pump set up is potentially a accident waiting to happen - ie, line coming off, dodgy wire wrapped at the carby end for adjustment, is it set correctly etc. My question: What are members thoughts on this? - and if they have choosen to remove the pump, what 2 stroke oil and mix ratio are you running? I am not too concerned re the dramas at the bowser as I fill up from a drum at home.... Comments???? (13B Ext port / IDA 48)

03-20-2011, 09:24 PM	#2
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro Posts: 1,046 Rep Power: 19	People do it all the time, whether for assurance or when making power. I don't premix even with a slightly modified turbo II, but many people would. Does your car sit for long periods of time? Loads of power? I'll let others and especially carb guys comment of type and amount... but really just any TC-w3 2-stroke specified. dramas at the bowser = doing stuff at fillup at a gas pump? __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

03-21-2011, 12:01 AM	#5
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro Posts: 1,046 Rep Power: 19	Yes there are block off plates available, and just cap off where the lines go into the manifold. It is as simple as it seems. __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

03-20-2011, 11:46 PM	#4
RX MIDGET MG rocket Join Date: Oct 2010 Location: Victoria Australia Posts: 40 Rep Power: 0	Thanks guys, Aussies have bowsers, not gas pumps. Engine gets started usually weekly and holds minimal fuel in tank, so I dont mind fuelling up by hand. Do those who run pre-mix usually remove the pump completly and fit a blank? Any comments for someone who has completed this task????