Direct port system underway :)

General Chat About Nitrous Oxide.

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mgbv8
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Direct port system underway :)

Post by mgbv8 »

Image



Perry Stephenson

MGB GT + Rover V8

9.62 @ 137.37mph

Now looking for 8 seconds with a SBC engine

http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw



https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw

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john 215
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Post by john 215 »

Hi Perry,

Nice bit of work 8)

Hope its ready for The Retro Show, will be great to see it in the flesh.

Cheers John
LIVE LIFE A QUARTER OF A MILE AT A TIME.

mgbv8
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Post by mgbv8 »

I hope it will be ready for the dyno next weekend mate :)

No serious power runs. Just data logging !!

Perry Stephenson

MGB GT + Rover V8

9.62 @ 137.37mph

Now looking for 8 seconds with a SBC engine

http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw



https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw

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dbv8
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Post by dbv8 »

Interesting Perry.
I am interested to see which distribution blocks and how many pulsoids you will be running on this set up. My direct port is just plumbed off to seal the system at the moment. I wouldnt dare run it after Trevor expressed concerns with the old style 'd' blocks i have.

Isnt there a concern the injectors could be too close to the valves? Something i seem to remember reading about 'reversion' ????
10.612 @ 129.77
176.5 standing mile.

mgbv8
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Post by mgbv8 »

I'll be using Y connectors Del!!

I've got a few D blocks but I dont like any of them to be honest. Too many direction changes. Y connectors keep the flow as straight as possible.

I may possibly use two fuel solenoids each side with one nitrous solenoid each side. I'm not sure if my controller will power 6 solenoids though so I may need a couple of mosfet triggers to wire in.

Reversion will not be an issue as I only intend to spray 10 - 15hp per cylinder and this will be under 8psi of manifold pressure.

Reversion was one hell of an issue with the spider on my engine though?

Perry Stephenson

MGB GT + Rover V8

9.62 @ 137.37mph

Now looking for 8 seconds with a SBC engine

http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw



https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw

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dbv8
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Post by dbv8 »

You may have seen my thread on the WON forum on the subject of using y splitters instead of the d blocks.
I agree much better but there is still a concern on distribution, requiring the feed line to each splitter to be straight for at least 2".
This takes up room and also adds up to quite some distance between pulsoids and injectors.

I can fit this set up ok on the offside of my engine but its tight for space under the plenum on the nearside. Also the pulsoids would be located in the heat above the manifolds. So a few design issues to sort out before i can go DP.
10.612 @ 129.77
176.5 standing mile.

mgbv8
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Post by mgbv8 »

The actual issue is fuel pressure and velocity mate!!

The nitrous does not have much of a job to do at 900 psi :)

It will get to where it needs to be pretty darn quick. But the fuel does tend to lag behind at low pressures. Thats why my DP system will be fed at 3 bar from twin rails with tank returns via regulators.

Make the fuel lines as short as possible and if you can make the nitrous lines from the solenoids 50% longer. The whole idea of making the lines run in straight lengths for a minimum distance is basic fluid dynamic stuff. This ensures a full head of liquid up to an injection point after a restriction such as the jet in the outlet of a pulsoid??

So why not fit the jet in the inlet (or even the outlet) of the injector to make sure that the medium being fed to the injector can dead head right up to the point of distribution ??

I have made this point to a certain guy we know and been told I was an idiot. But I can guarantee that before long there will be a new system on offer that has jets where I said they should be ??

Its all a matter of timing mate. The main issue being getting the fuel and nitrous squirting out of their respective holes at the same time and in the right quantities :)

I've done so much track testing on my engine that I can pretty much get it spot on. And my own home made system for this DP setup will work fine from the first time I use it.

What are my qualifications for saying this??

A box of 26 melted pistons. Around 50 melted spark plugs. And 3 ruined engine blocks.

And I hope to be proving my point later this year in August or September when I have my system finished and running on an already damaged engine block.

If all my other stuff holds out (gearbox is playing up) I hope to go heavily sub 10.5 with just a sniff of gas under my blower ??

Perry Stephenson

MGB GT + Rover V8

9.62 @ 137.37mph

Now looking for 8 seconds with a SBC engine

http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw



https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw

mgbv8
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Post by mgbv8 »

DP system now fitted and blanked off ready for some dyno time tomorrow to see what the blower does :)

Perry Stephenson

MGB GT + Rover V8

9.62 @ 137.37mph

Now looking for 8 seconds with a SBC engine

http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw



https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw

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