Search found 131 matches

by bumpstart
Wed Nov 02, 2016 7:56 am
Forum: Propane Forum
Topic: Atomising Liquid Propane
Replies: 8
Views: 1037

Re: Atomising Liquid Propane

there would be an issue with fidelity if using one injector tor for both liquid and vapour even with pressure and temperature compensation /fuel density map the injector needs very finite control and tiny injection period with liquid, but outrageously long duration required with vapour as mentioned ...
by bumpstart
Sun Oct 30, 2016 11:12 am
Forum: Propane Forum
Topic: Atomising Liquid Propane
Replies: 8
Views: 1037

Re: Atomising Liquid Propane

im thinking comprex pressure wave supercharging on a 2 stroke or miller cycle compression ignition engine at a whole new level of efficiency// using the expansion ratio of liquid propane/butane to both a mechanical and adiabatic advantage inside the comprex supercharger//, also acting as the primary...
by bumpstart
Sat Sep 24, 2016 8:04 am
Forum: Your Car
Topic: Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )
Replies: 3
Views: 2155

Re: Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )

well. ive been a bit slack updating this one still my daily user . motor has now progressed to a mildport 13bt ( 4 port ) . though im still using the same turbo combo a haltech e8 ecu has been running full sequential 4 coil ignition, boost control , safety cut and power valve solenoid operation for ...
by bumpstart
Tue Mar 29, 2016 9:28 pm
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

a blow through setup does make all the difference its current rating is a 101.3 kpa. round that to 14.7 psi at 15 pounds boost it is now just over 200 kpa . and the airflow rating is similarly almost doubled the vapouriser works like a fuel reg in a EFI petrol car. referenced to manifold pressure, s...
by bumpstart
Mon Jan 25, 2016 12:26 am
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

the reg is very different and much smaller than the mixer reg.. the latest are all milled metal and look remarkably like a large petrol aftermarket fuel reg. but with in/ out coolant hoses ( and a wiring pigtail ) and two outlets for v bank/staged bank etc it does not need to reduce the pressure as ...
by bumpstart
Fri Jan 15, 2016 8:31 pm
Forum: Propane Forum
Topic: Blow through turbo Snowmobile
Replies: 12
Views: 1116

Re: Blow through turbo Snowmobile

the impco VPV also uses the same secondary chamber and pill method for controlling the fuel.
it works just fine and it will err to be slightly richer as boost gets higher
because the differential between the delivery pressure and that post mixer rises with increasing boost
by bumpstart
Thu Jan 14, 2016 4:13 am
Forum: Propane Forum
Topic: Blow through turbo Snowmobile
Replies: 12
Views: 1116

Re: Blow through turbo Snowmobile

my thought on the SV. .. or VPV a VPV or similar , as pointed out by gerald can operate also as an SV .. the VPV from impco is not boost rated .. your parts will be cold and more brittle and i wouldn't like to trust one under boost as for myself i use a HP shut off solenoid and a relay / mounted ont...
by bumpstart
Thu Jan 14, 2016 3:37 am
Forum: Propane Forum
Topic: Blow through turbo Snowmobile
Replies: 12
Views: 1116

Re: Blow through turbo Snowmobile

nice rig. surprised at that fire up when cold. would have thought you would need a squirt of ether or a bag warmer for the bottle to help the cold start think also that you have been given a petrol AFR scale ( ie. running LPG but reading it on a wideband that is scaled to petrol AFR ) if you convert...
by bumpstart
Wed Jan 06, 2016 7:15 pm
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

i suppose that would be a nuance from the source of your particular blend. but i have been driving at 190 F for almost 10 yrs ! i dont have the filter in my lockoff solenoid anymore though when i pulled it the issue was dry rust /dust on the little magnet the model E is designed to run flat and keep...
by bumpstart
Mon Jan 04, 2016 9:25 pm
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

it is a system added to older cars to supplement the lack of valve lubricant in LPG fuel . just a bottle and a metering dripper and not unlike some water injections systems putting it pre turbo gets rid of issues with the bottle needing to take boost pressures and makes the metering easier to setup ...
by bumpstart
Mon Jan 04, 2016 6:03 am
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

you are burning propane or propane/butane VAPOUR. by which it means there is little to none advantage in latent heat exchange with the inlet air in fact there is some minor volume displacement of the inlet air due to the expansion ratio of the LPG fuel when introduced into the inlet airstream it use...
by bumpstart
Fri Jan 01, 2016 11:15 pm
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

nah impco 200 still do it easy at .75 to 1 bar boost
by bumpstart
Sat Dec 26, 2015 12:18 am
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

under boost you will be surprised ..as the motor will like significantly leaner mixtures than its petrol equiv and as such the BTU thing becomes irrelevant in the context where at 1 bar boost with petrol it must run at around 11:1 mixtures to keep flame speed within a margin and to maximise boundary...
by bumpstart
Thu Dec 24, 2015 1:53 am
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

model E sits flat and model L sits vertical ( outlet down ) with its back to firewall . both tee together on the main delivery line to the mixer this way i have both setup so they cannot collect the various condensate mustards that can come in the LPG blends and that at any moment i have at least on...
by bumpstart
Sat Dec 19, 2015 10:03 pm
Forum: Propane Forum
Topic: turbo propane set up
Replies: 58
Views: 11033

Re: turbo propane set up

PS in lieu of a VPV..( vacuum power valve ) . i needed something i would trust into boost ( VPV not rated for boost though it may survive for a time or may/ may not work with an NRV installed in the hose ) i instead use a HP lockoff solenoid . mounted off the LP side of the convertor .. through a pi...