NITROUS OXIDE ( nos / n2o ) advice forum

Nice Perry, do you reckon you'll put a burst plate or relief panel in the intake manifold somewhere, in case you have a burp or backfire? I put one in because the guy who was going to tune it on the dyno said he won't touch it unless it had a burst panel, that didn't give me any confidence in his tuning ability.

Paul

If you can inject under the blower that's best, as the blower then acts like a block to reversion.

I've been told that the blower has a blow off plate fitted somewhere on it.
I'm looking forward to just getting back out and doing some mild testing. Anything in fact to get me strapped back into the car to hear my engine again

At least it will be another year of hands on testing and experiments. Theres nothing I like better than saying to myself. "I wonder what would happen if I did this??" Then spending time working ou the pro's and cons on paper. And when I've had enough of doing that I just go and try it anyway

I'll get more of an idea about gas plumbing when the thing is sat on the workbench I guess.

Why would a positive manifold pressure block reversion ???

Surely its a matter of air flow / velocity and not air pressure in the inlet runners ??

I can see that having a positive pressure in the inlet manifold will increase the amount / volume of mix that can flow into each cylinder when the valve opens. Thats easy to visualise. But when the inlet valve is closed for the split second there will still be a dead end for reversion to happen regardless of static pressure in the runners.

This was the basis for me designing a plate to go on top of the blower and under the carb so the extra nitrous / fuel mix is well entrained into the plenum as a mist so each runner can suck in just what it needs (regarding volume dependant on each cylinders VE) without having to worry about fuel and nos bouncing about and not mixing in the runners.

I think this will give me a better chance of even distribution on my particular setup

Looks like the blower will be with me in the next 2 weeks.

I'm getting quite excited about this now

Pel , When i ran the old system (Inj before Blower) the data logs showed no improvement in charge temps , unfortunatlly i can't data log the D/P system as there isn't any room for the sensor, but there is a differance in performance for a given N2O Jet size . The blower will heat up the air/fuel even if you start from cold , on a N/A run my start charge temp will be 80F at the end of the 1/4 it will be 120F and thats with a Water to Air Intercooler + Fans on all the time in the lanes.
Go for After blower Inj if you can fit it all in ,it will help keep the detonation at bay + the jet size will be smaller for a given BHP

Austin

Surely its a matter of air flow / velocity and not air pressure in the inlet runners ??
NOPE!!!! It's a matter of OBSTACLES

Aha!!
I'm seeing the point now
The nitrous mix would just bounce back into the plenum where it gets bashed on the head and told to **** off back to the valves

If the system is as I wanted it the inlet manifold will not be the edelbrock low profile 360 but a hi rise jobby like my Harcourt. I wanted it this way so it gives me the option to spray under the blower. Or even go DP.

So under the blowrer it shall be.....

Thats gonna be the plan going forward now Austin.
I've also bought a tin of that Power Pour additive. If it does what the guys who use it say it does it should be a fantastic det supressor.

BTW!
I spoke with the blower guy today and there have been delays with parts in from the USA. Looks like I'll be collecting it on Friday 6th now. The supplier is one of the best guys I've ever dealt with for specialist auto parts. He holds his reputation as high as Trev does. He wont let anything out until its spot on. I wont advertise but I will pass on his details by Hotmail if anyone ever decides to go for an old skool blower on their V8.

Regards to all
Pel

Soon to be running 4/71 + won

NOT a cat in hells chance of it being anywhere near as even as the Spider delivers, PLUS it'll be nowhere near as dense as when delivered by a Spider!!!!!
The up side for you, is that you're likely to spend so much time sorting the mixture and timing on the new set up, that you'll be ages before you try making anywhere near as much power as your tried with the Spider, so the engine will probably survive for a good while but my prediction is, that you'll suffer the same kinds of failure at much lower power levels once you've fitted the blower, than you did on nitrous alone, UNLESS you improve the head gaskets.

Assuming I can get the ign timing right for the amount of boost I'm using (6-8psi) do you think I'll be making more cylinder pressure on the blower than I did with the 300 shot on the spider??
My main aim is not to use the blower as the main source of power. Its main job is to reduce the amount of gas I use and to make what gas I use more efficient if you see what I mean. On my old crossfire plate the 300 shot gave me 202hp increase on the stock low comp 200hp engine. I'm hoping that with the right boost I can get another 100-125 hp and then add gas to top up to the 402hp mark where I was before.

Have you any ideas on how the torque may be affected on blown vs nitrous ??

At least the good thing with the blower is that you have more power straight off the line to help with your 60 foot times, as you said you have a nitrous delay of 0.4 secs (so you are waiting for the power, if your 60 ft times are 1.5 secs approx, then 0.4 secs of that is a pretty big chunk of wasted time, that's if you have good traction), the extra power the blower makes will bring your converter stall rpm up also, only good if your stall speed is lower than optimal.

Paul

A correctly fitted system wouldn't have 0.4 secs delay and would be more instant than a blower, as nitrous can be set to deliver whatever extra power is needed from the outset.
With a REVO system you can even activate it prior to launch (along the lines of building boost when staging), to ensure the system is primed and flowing even before you nail the throttle.

Check that!!
Its 40 milliseconds ?? 0.4 is 400 milliseconds isnt it DOH!!

I know the blower will sap power. But the sheer cost of a decent twin turbo installation is way above my budget unless I want to give up racing for around 3 years to save


And hey!! Its an old skool blower setup. The looks alone will be something for me to enjoy. And with the kit the way it is I can swap between the blower and the old setup in a couple of hours for some trials

pels getting nostalgic and retro trev...you watch he will be throwing his dab radio away next and getting a pye with a dial..

Ha Ha Ted !!

I have a nice Roberts radio in the Kitchen and a Dansette record player in my bedroom

This year is going to be about having some fun and showing the car off a bit. I want to get some more media coverage as well while I'm climbing the time ladder back into the mid 10's and eventually into the nines by the end of this year or early next season.. 2009 was a banner year for the car and 2010 was mediocre with a damaged engine that I still got into the high 10's with blown head gaskets at 900 feet out, and I have no worries about anyone else with a Rover powered MGB beating my 10.6 world record. There are plenty of Americans with blown Fords and Chevs in their MGB's but as far as I know none of those guys have even got near my UK track times with the won stuff on the Rover V8

The more the car gets noticed in the Drag Racing press, the better chance I have of bagging more sponsors for advertising etc

So 2011 for me will be mainly showboating and maybe during shakedowns I'll get some reasonable numbers..

out of interest pel does a blower add alot of weight to your set up.....

I love the set-up, it reminds me of the original Mad Max Intercepter.
Vivienne saw something different and quite cute. Do you remember the robot in "Short Circuit", it was called No.5
How bizzarre

He was called "Johnny 5"

The blower weighs about 45lbs Ted !!

Whether it'll work better than just nitrous or not i don't know but it cirtainly looks awesome

Ian

Here she is in daylight for the first time

Love it

hey perry looks great, you have taken me right back to my youth 70s drag racing great memories