SupraGlue

Phil, the Merc engine used a loophole that allowed it 3.5 liters versus the 2.65 of the OHCs. It had pushrods roughly the size and length of your thumb, which DID compromise port size and shape. Despite this, they were dominant despite the fact that they didn't rev as high. It was probably the pinnacle of pushrod engine design, yet still couldn't have existed without John Menard's lobbying of Tony George (irony, oh irony). No one would ever have dreamed of running pushrods at Indy or in CART at the same displacement as DOHC. I meant to get back to you also on earlier questions you raised. Others have hit on the matter of port size, shape and angle that you can achieve with DOHC that simply can't be done with a pushrod in the way. You can look at what GM did with their SB2 heads to see the gymnastics needed to get bigger ports in there. There is also the issue of valve area. I'm sure someone will claim that 4V pushrod heads are possible, but until we see it in production, we're going to have to give the nod to the DOHC. There is also the matter of spring pressure and valve seat rescession. Two smaller valves running lighter springs will put a lot less force on the valve seat. If you are concerned with torque, you can make your DOHC engine a rocker arm type, thus getting valve lift multiplication from the rockers and a boost in mid range torque if you so desire. Shim and buckets will be happier at hight revs, but at no lift multiplication. So what we are left with from the pushrod advocates is that smaller valves and smaller low angle ports are "better". I am not buying into the cheaper argument. I have priced what high RPM pushrod components cost, and am not impressed, especially when shim and bucket valvetrains can easily live at 8500rpm with only spring upgrades. Believe me, if someone would give me a ser of Arao DOHC heads for my Chevy SBC, they would be on in a heartbeat. (Heartbeat -- get it? tongue.gif )

I weep for your generation. graemlins/nonono.gif Please don't breed. Thanks.

Banning a technology through the rulebook != the legal tech being superior.

By the time you build a pushrod motor right, you made the ports all big and lost that precious low end torque anyway. Back in the real world, you trade torque for horsepower and RPM in order to win races. Even in pushrod series like NASCAR and NHRA. The only way around that tradeoff is to add inches, spray or blow it. Those 4v mod motors come out of the box with some nice ports. Too bad the motors are the size of elephants and their valvetrains cost more than the GNP of Sri Lanka (sorry Morgan! tongue.gif ). Packaging and cost are their biggest downfalls. Ford ought to also gear their cars right, then people would whine less. Speaking of gears, man, I can't believe the "torque, torque, torque" crowd is forgetting all about gears. What's the first thing you do when you take your pushrod motor and give it a bunch of port and cam? Maybe put gears in it? Do you think that the Fords like some gear? Getting back to what sucks about DOHC on a V motor -- four cams is a mess. The timing chains on those cars are 50 feet long or something, and I'm sure that it's a whole day's entertainment to swap cams and time them. A cam swap on a pushrod motor is a quick and simple way to really make some power, but on the Ford DOHCs, it's an investment requiring a second mortgage and a large check to Hensler. So, sum it up like this -- look at the Ford Racing catalog, and look at two engines: 5.0 pushrod and 5.0 cammer. Dollar for dollar, you can make probably make as much or more power with the pushrod. BUT...for a set displacement, you are going to make more power PERIOD with the DOHC. Anyone think that there is a reason why no racing series on earth has pushrods and DOHC competing at the same displacement? The world doesn't live around dollar for dollar, though. When you lose a race, you can't whip out parts receipts saying "Well, I spent less money!" That's as lame as the ricer bullshit about cubic inches. Oh, interesting story about why the LS1 wasn't made as a DOHC motor. GM prepared two test mule Corvettes -- one with a prototype pushrod engine, the other with a prototype DOHC. They then let a bunch of executives drive them around the proving grounds and decide which one they liked better. The execs picked the pushrod motor, so it was decided to make the LS1 pushrod. Note that engineers did not decide this. Racers did not decide this. Even Corvette buyers did not decide this. A bunch of grey-haired 50-60 year old men who spent their careers at such automotive giants as Proctor and Gamble decided this. Credit GM engineers with making a fine motor anyway. You can't help but wonder what might have been, though.

Score one for truth, justice and the American way. graemlins/offtopic.gif The "city" of New Rome has finally been officially dissolved: http://www.nbc4columbus.com/news/3598592/detail.html

It is disturbing how often DJ tries to steer the topic of conversation towards his ballsack.

Oh, and to stay on topic -- slow cars suck. It doesn't really matter if they have neon lights or not. That would only make me say, "Gee, there is a slow car that sucks AND it has neon lights." Fast cars should always look as close to 100% stock as possible with the hood closed. This keeps police officers at bay, and serves to confuse the hell out of the guy on the bike who finds himself several buslengths back and fading rapidly.

Did someone say "roll"?

A DSM owner preaching about reliability is like a porn star preaching about virginity. tongue.gif Just don't go there, man. smile.gif

Flaming yourself (and poorly) might be one of the worst acts of attention whoring in CR history. graemlins/nonono.gif Even Geoff has more self-respect. tongue.gif You are no longer permitted to be my nutswinger. Sorry. graemlins/nutkick.gif

Oh please. Your car hasn't been any closer to a dragstrip than I have been to Carmen Electra naked.

Please stop hitting on me. Your little man-crush thing is getting creepy. Thanks. graemlins/puke.gif

That's it. I am selling my RX-7. graemlins/nonono.gif

This shit is great. You even let that homo Steele back in. Fucking bravo. Now make your brother come in here so he can get smacked around like the bitch he is. graemlins/thumb.gif

Are you sure you don't know him? lol!!

Seriously, don't flatter yourself. No one cares what you think, I promise. I only wish you were more entertaining. Maybe you could tell us how many strippers you could pick up if you only owned some overpriced piece of shit Viper. graemlins/jerkit.gif

You talking about Chris, or is that your autobiography?

This is Mark. smile.gif I don't have time to wade through every error in this thread, but the one that jumps out at me is "peaky powerband". The rotary has many documented strengths and weaknesses, but to claim an NA or turbo rotary is "peaky" is complete horseshit. "Peaky" is a torque curve that hits a high at 2500 and straightlines down from there, like my 388 Camaro. Quit reading dyno sheets on the internet and drive the fucking car.

This is Joe, not Mark. No The makeover in 1989 saw The Turbo II get a new turbocharger. Mazda called it the "Completely Independent Twin Scroll". The impeller was fed directly at the exhaust port. Per Mazda: " This permits the powerful exhaust pulse generated by the opening of the exhaust port to directly hit the turbine blades without interference from the exhaust from the other rotor." This newer design resulted in reduced turbo lag and increased torque. The Turbo II's wastegate was now electronically controlled, rather than the old mechanical design allowing higher boost pressures. These modifications resulted in peak torque being available from 2000 through 5000 RPM. Horsepower climbed another 18 to give the 1989 Turbo II a total of 200 HP @ 6500RPM and 196 lb-ft of torque at 3500 RPM. The 16 wheels which were used were lighter than the previous design and a new parcel shelf was added that hid items in the "trunk". Seems torqueless to me. Cause 11.50s with an ass load of spray makes a car fast, you homo graemlins/finger.gif

"Hey, mechanics have to deliver parts and sweep the floor too!" tongue.gif

Daaayum, Gina!

Get used to the Tc, because after 2005, the Celica AND the MR Spyder are gone. Apparently, the Tc is now Toyota's idea of a "sport compact".

You gotta keep your woman happy, because if you don't, some other guy will. True story.

My dad's neighbor down in Athens has a 1940 that he painted Prowler purple. They make unique street rods because you don't see them much. Good luck, I hope it's decent enough to work with. graemlins/thumb.gif

Yeah, Home Depot sells a lot of Craftsman brand items.