Downey
SILVER Star
I will be just fine knowing that many of you got away with boost (good for you), and that I spent the rest of my days on earth having never spent money to repair Boost Carnage!!
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I will be just fine knowing that many of you got away with boost (good for you), and that I spent the rest of my days on earth having never spent money to repair Boost Carnage!!
Mr Jim of Downey,
I agree totally with a difference in weight, which in turn= better power to weight ratio! No argument with that
Now, back to the question of boost; Downey was in business for 39 years, and most of the engines we blew to kingdom come while testing forced induction systems were blown up before many of you were born. 3 to 5 lbs is probably ok if you have OEM internals. 6-10 lbs is probably ok if you have forged pistons and heavier duty wrist pins and connecting rods. The big problem is 3-5 lbs of boost equals about the same performance gain as installing a Header ($2-300.00 for Header, $2-3,000.00 for Supercharget/Turbo). My guess is that those who have found success with forced induction are those who bought a factory installed unit, not aftermarket add-on!!!
we're talking 40 series here tho. if weight were a concern... we'd drive jeeps.
gotta be something said for all that inertia of a big heavy crank, a big flywheel and 6 big heavy rods spinning. makes it lug nice.
Okee-Dokee, I concede, BUT most the post I've read on Mud deal with guys considering installation of add-on forced induction onto their old school engines with stock internals.that was all well and good back then, but this is 2009. forced induction has come ALONG way. i mean just look at the first gen factory turbo cars out of Japan. peaky, tempremental, and really not pushing out that much power all up. fast forward to today, and the wonders of technology see 2 litre 4's put out more, reliable power than a small block chev, and 4 litre 6's put out more torque than a Gen 4.
and yes, all these technologies filter down into the aftermarket. back when downey was testing boost "in the old days", boost regulation would have seen a turbo/supercharger "limited to" 6 pound see spikes of 14 pound because boost controllers were primitive. Fuel maps couldn't keep up, leaning out caused predetonation etc. and you ended up with a ball of molten slag.
today we understand so much more about what works and doesn't work for boost that it's not a black art anymore. hell, a 20 year old with a welder and an ebay account can probably end up building a boosted motor for almost any car and have it hold together for years.
Yes the 2f has crank support issues, so you can't run as much boost as the import tuners, but you can certainly liven the old girl up reliably, and cost-effectively.
Okee-Dokee, I concede, BUT most the post I've read on Mud deal with guys considering installation of add-on forced induction onto their old school engines with stock internals.
I assume when everyone is talking Superchargers they are talking screw/Roots-type blowers? What about a simple belt driven centrifugal type, like ProCharger? Less boost that a Roots-type but that seems to be what everyone is saying the 2F can handle. Does not seem like that would be a very technically difficult install, either.![]()
matty_sunn1 said:why waste your time with a 2f just go 2jzgte maybe 800 hp with a few bucks. 6-8 pounds aint worth it, it a tough engine but you start boosting it probaly wont be reliable over time.
yes it is a roots style eaton m90 running a simple serpentine belt. the worst thing with the 2f is the lack of engine balance on three conrods there was up to 80grams difference but since having the motor balance done it runs very smooth.
....... the worst thing with the 2f is the lack of engine balance on three conrods there was up to 80grams difference but since having the motor balance done it runs very smooth.
hello waiting for time i originally started with a toyota supercharger running 10" pulley on the crank and 2" runnig a holley 465 was a over 50% power increase until the shaft on the supercharger sheared off on the highway. any how thats when i bought an eaton m90 and swapped to gas using the 465 base with impco 425 mixer much better response running a blow thru system have been using this set up for 5 years. i will try to attach a few photos.