Is 10-15 HP really worth $3,500.00?

[126coupe]

I was planning on twin-plugging my 2.5L race motor.
After crunching the #'s I am looking at a $3,500.00 bill.
$2,500 Distrib., Machine work $300.00, 2-MSD's $460.00, 2 blaster coils $120.00, wires $300.00.

I think my $$ is better spent on tires, $600.00 a set, thats 6 sets!!!

[North Coast Cab]

No. If you have the right high compression engine, cam etc. to utilize the benefits of twin plugging you'd get a lot more than that. Also, there is some cost reduction whe you sell your old distributor, coil etc.

J

[Facey]

that is of course unless by twin plugging you prevent knocking, or many other possible faliures.

don't look at twin plugging as a performance gain, as it offers very little in that regard (does allow high comp and larger bore..) but it is capable of making a more consistent and reliable burn.

its insurance and peace of mind... along with the coolness of having the same # of spark plugs as a v-12 :P

one other note, i'm not sure if this is related, but because of the increased burn effienceny my physics skills tell me that the temperature loading should be less...... could be wrong though... never really hit any practical applications.

[sammyg2]

I am amazed at how much some folks pay for a few more HP out of their 911s. Even SSIs and muff cost at least $100 per HP increase.
I'm a cheap SOB so I prefer to just pressurize the intake and pay around $15 per HP.

[randywebb]

Where did the $2,500 Distrib. come from ???

You have to decide if the insurance and smoother running + a bit of hp is worth it to you.

If you have the motor apart, then defintiely get it bored for twin-plugs now. You can add (or not add) the other items later.

[126coupe]

Well I went for twin-plugging. JB Racing out of florida makes some very nice quality stuff. Off to the machine shop!

[126coupe]

The distrib.

[126coupe]

Originally posted by randywebb
Where did the $2,500 Distrib. come from ???

You have to decide if the insurance and smoother running + a bit of hp is worth it to you.

If you have the motor apart, then defintiely get it bored for twin-plugs now. You can add (or not add) the other items later.

Rennsport Systems out of Oregon

[Bobboloo]

You can get 10-30HP at the track for less than $100.

Water vapor cooled 911 - the Rubbermaid Solution

[Facey]

twin plugging is not only neat/fancy, safe but if orignally planned i believe it allows for more power to be made.

i am running 100mm pistons with more then 11:1 cr.... try doing that without twin plugging... would be a mess real fast.

w/o twin plugs your limited to around 97mm bore and defiently no more then 10.3:1....combine those differances, 3mm bore and .8 cr+... and you have more then 15-20hp on the table.

add that in with saftey and the bragging rights..

[randywebb]

Well, a few years ago I went with the dual drive 964 type dist. with SC inards. I think I paid about &800 and $60 respectively for the used parts. I forget the cost for a guy to put it all together but it was < $1,000 total I'm sure.

OTOH, it is heavier, can have belt failure, and just looks like a kludge compared to a true 12 output dist.

Maybe the 12 dist.s are cheaper now with the Burn bros. caps avaialble??

[Carrera3.5L]

Is 10-15 HP really worth $3,500.00?

While the cost is indeed expensive, the benefits are there (power, fuel economy, reliability)...

In your dedicated track only car, that 10-15 horsepower may be the difference in finishing 1st or being the 1st loser...

Ralph

[126coupe]

Originally posted by Carrera3.5L
Is 10-15 HP really worth $3,500.00?

While the cost is indeed expensive, the benefits are there (power, fuel economy, reliability)...

In your dedicated track only car, that 10-15 horsepower may be the difference in finishing 1st or being the 1st loser...

Ralph

Well I got the price down to $2,600.00 Thats everthing I need. With a little more aggressive cam (fom GE60 to an 80)
a bump in CR from 10.1:1 to 10.5:1, the twin-plugging I believe I will feel the difference, not to mention how cool the big Distributor will look.

[afterburn 549]

m.o. why not go stand alone so you have options later...your not far off $ wise and is more flexible

[JohnJL]

There are other twin-plugging alternatives for much less...www.msefi.com

There are some here running EDIS twin plugs off Megasquirt 2 for $500 including machinework and have a fully programmable ignition curve to boot. You don't need to use the EFI components if you don't want but they'll always be there when you want them...

[afterburn 549]

and you dont have a hvy thing ( dizzy ) hanging out the back of the car..

[efhughes3]

The sick thing is, if we had American iron, we could get a nice crate MOTOR for that kind of money. But then again, they need to spend money on chassis, brakes and such to try and get on par with us.

[Zeke]

Mark, are you kidding? There are lots of guys out there that will do anything with any kind of money to be a half a car ahead at the end of the straight. Every lap. If 15 HP don't do it, then you'll have to spend another wad for 10 more, and so on. Or, you're not a racer.

Now, I read Grady's thread on the water injection. I've heard good things about water injection all my racing and automotive life, in general. Why aren't there bolt-on systems available like all this NOX stuff?

Mark, you could have the extra from both and the second one be a lot cheeepa. Put a '72 type oil tank in front of the regular one. Oh, wait, your oil tank is this silo that sits in the pass side. In that case, use a regular oil tank for your water. A '69-'71 cold start spray bar is all you need to aim that water down the 6 throats.

[afterburn 549]

we are all sick anyway LOL

[gumba]

while the 12 plug distributors are cool, I would think you would have better control over setting up the timing with an Electromotive system or something similar. My old Electromotive HPV-1 lets you set up the timing at idle, 3K & 8K with a rev limiter.
3.4 twin plug, Electromotive, 46mm webers for the race car
3.5 twin plug (Bosch 12 plug dis) turbo for the street car