View Thread: Twin cams


mrgokou
Ok Guys, I already know alot of ways to mod Twin Cam engines, but i'm looking to find out if any of you guys Know. THis should be real easy. Just list the mods u can do to a basic 4 cylider twin Cam to extract power.

and u wil be rewarded with:
:boobies:
Very large and bouncing BREAST:cheers:

eric
more agressive cams would be a start

911GT2
Definitely cams, valves and springs.

Then there's your usual intake/exhaust mods, which will do more for you than it would for a SOHC/OHV engine because they breathe quite heavy in the high revs.

89TTA
cams are the wrong way to go... you're just :banghead:

here is my list (you never gave me a max price, so i'm going expensive :D )

1) pull heads and all of intake
2) take heads and intake to my ex-work to get them p.p., intake matched to head
3) *censored* <-- trade secrets
4) put all of it back on the car...
5) car is now pumping more air into the motor (which is essentially an air pump in the first place), but can't escape it fast enough (and since he asked for power, not torque) :nope: . so that means you have to pull off the stock exhaust manifold and replace it with a long tube header and a high flowing exhaust.
6) custom cai will proceed from there... mainly because you import people pay a ridiculous amount for a pre-made cai

there are several more things you can do now (not in any particular order):

1) replace cams
2) short runner intake (which produces power vs long runner intakes which are for torque)
3) bore (not stroke, which increases torque)
4) nitrous or turbo

this engine might have trouble getting out of its own way off the line... (probably not, but this is a "just in case scenario") so you'll want a blower or nitrous to help it out... or nitrous on the low-end and a good blower...

911GT2
Cams are the wrong way to go?!?!?

Please explain yourself.

89TTA
Originally posted by 911GT2
Cams are the wrong way to go?!?!?

Please explain yourself.

if you have heads that won't flow good at increased lift (i.e. stock heads), then a bigger cam won't help you any. you're running a small cid motor with horrible a horrible stock head casting... maybe if you're running a v8 with bigger cid, then a cam would be a good starting point, but even then, your increased lift and duration won't be able to pull in the air needed for higher horsepower.

911GT2
Many new imports (of which the bulk of DOHC motors come in) have fully sufficient heads and a fairly nonrestrictive intake.

89TTA
Originally posted by 911GT2
Many new imports (of which the bulk of DOHC motors come in) have fully sufficient heads and a fairly nonrestrictive intake.

see, that is where specification would come into play... to which he didn't specify, now did he. he asked for a general way to make the power... my list is for a complete general listing of what to do to make power out of it...

under that new guideline (modern day import dohc i4), i would see replacing the cams as sufficient... however, i'd start it out differntly then just cams first... i'd go with this:

1) bolt-on turbo kit
2) go with my steps below (minus the header, but with the turbo manifold and p.p./cam/intake custom designed for the turbo setup)
3) increase the injectors and fuel pump
4) run a bigger turbo (a precision t-49 is a fast spooling turbo for adequatly flowing heads...)
5) run mild boost around 8 psi (not sure of how strong the bottom end will be... that is a lot of boost from that turbo... generate lots of power)
6) drink a beer
7) smoke a cigarette
8) then i'd probably go even further...

1) ultra-light weight billet bottom-end components
2) ceramic coated pistons, valves, exhaust ports, and the cylinder walls
3) nitrous cooled air to air intercooler... OR iced intercooler
4) complete engine management (FAST)

i mean, we could go on and on and i'd design you a damn fast, but damn expensive car... then again, those without parameters.

SLP Addict
You Sir, no your shit.

911GT2
For max power, a turbo is definitely the way.

But that ain't too reliable for a daily driver.

911GT2
And fuckin watch out for SLP, he'll be asking for your number before you know it.

SLP Addict
I told logan to come here smart ass..............me and him are friends :fyi:

89TTA
Originally posted by 911GT2
For max power, a turbo is definitely the way.

But that ain't too reliable for a daily driver.

i have a 500+ rwhp turbo motor... it is fine as a daily driver despite the fact that we have $4k+ suspension mods on it so that EVERY single mis-placed rock on the road is felt...

mrgokou
Originally posted by 89TTA
i have a 500+ rwhp turbo motor... it is fine as a daily driver despite the fact that we have $4k+ suspension mods on it so that EVERY single mis-placed rock on the road is felt...

dude, the steering must be like puty in ur hands.

I'd much prefer a stiffer type of suspension. It kinda sux to feel a speed bumb 1 millimeter deep.

89TTA
Originally posted by mrgokou
dude, the steering must be like puty in ur hands.

I'd much prefer a stiffer type of suspension. It kinda sux to feel a speed bumb 1 millimeter deep.


the steering is STIFF and can turn on a dime, but with the ultra-hard setting of the Koni shocks, sub-frame connectors, stiff springs (still can't remember who they are from... i think Global West), Spohn torque arm, global west panhard bar and control arms, and pretty much every bushing made out of polyurethane... the ride is just rough

now where are those tits you offered?!

Rotary Boy
damn man nice car. you ever take it to the track or strip?

911GT2
Originally posted by 89TTA
i have a 500+ rwhp turbo motor... it is fine as a daily driver despite the fact that we have $4k+ suspension mods on it so that EVERY single mis-placed rock on the road is felt...

Very interesting.

How many miles? And what extent are the mods?

89TTA
haven't take it to the track yet, because it is to much fun to keep pulling it apart and rebuilding it :D

Originally posted by 911GT2
Very interesting.

How many miles? And what extent are the mods?

only things stock are:

block
rods
crank
driveshaft
rims

masestylez
Originally posted by 89TTA
haven't take it to the track yet, because it is to much fun to keep pulling it apart and rebuilding it :D



only things stock are:

block
rods
crank
driveshaft
rims

You have rims on your engine? Damn that's bling bling!

:fro:

911GT2
Originally posted by 89TTA
haven't take it to the track yet, because it is to much fun to keep pulling it apart and rebuilding it :D



only things stock are:

block
rods
crank
driveshaft
rims

That's probably why it's been able to hold up to that kind of pressure. Nice job.

A-Tech
Originally posted by masestylez
You have rims on your engine? Damn that's bling bling!

:fro:

hahaha, nice.

89TTA
here it is

and yes, all the shiny stuff IS chrome

911GT2
Very nice man.

I'm not a huge fan of engine chrome though. Still a nice car.

mrgokou
MY GOD!!!!

and that's street legal?????

Wher are u from man?, i got to go to your shop.

SLP Addict
hehehe, im gonna love to see your reaction when he responds to this!

89TTA
Originally posted by mrgokou
MY GOD!!!!

and that's street legal?????

Wher are u from man?, i got to go to your shop.

what? what isn't street legal about that? that WAS the stock intercooler... that was only a PT-49 turbo (stock replacement, and looks like the stock T29)... the only thing on the engine bay that has changed (that a cop can notice) is an added fuel pressure guage (which says 42 psi... and the motor wasn't on at the time) and an engine breather on the valve cap (which, if the guy knew the car, means that EGR isn't active, but what the hey, all american cars for the most part just have an oil cap there).

what you DON'T see is a chrome overdrive pulley on the crank that is tilted at a 45degree angle towards the ground... we split the block and crank in half on the dyno because the engine builder forgot to tighten the main bearing cap... with 33 degrees retard... we hit 451 ft/lbs of torque, and 315 hp (both rear wheel)... on the run before it broke... (note: we had quite a bit of negative timing, being that the STOCK chip we were using had only 12 advanced... that means the numbers are/were severely lower then what they should have been).

my shop? yea dude, it is in my garage.... or driveway, depending on what needs to be done. :D

honestly, the car was street legal... emissions legal, we failed at 650 rpms... ;) but that was without TRYING to pass it... we have an alcohol injection kit for that car, so we can run LOTS of alcohol through that motor and maintain high octane, but with low emissions. ... ... OH OH, and the bolt on cat... we had a 3" dump on at that time

anyways... that is all

Carlos Carrera
Originally posted by masestylez
You have rims on your engine? Damn that's bling bling!

:fro:
:bigbounce

Carlos Carrera
Can you explain this two points deeply.
2) short runner intake (which produces power vs long runner intakes which are for torque)
3) bore (not stroke, which increases torque)

Dreamn
Originally posted by Carlos Carrera
Can you explain this two points deeply.

i have no idea what two means

increasing bore gives you a greater surface area upon which the explosion acts, increasing stroke lengthens the distance a piston travels, giving you more momentum or something. I could be wrong, 89TTA or Rotery Boy will know and kick my ass for the above dumb comments (in the event that they are dumb):pimp:

Carlos Carrera
Originally posted by Dreamn
i have no idea what two means

increasing bore gives you a greater surface area upon which the explosion acts, increasing stroke lengthens the distance a piston travels, giving you more momentum or something. I could be wrong, 89TTA or Rotery Boy will know and kick my ass for the above dumb comments (in the event that they are dumb):pimp:
hahah i know what are bore and stroke. :cheers:

Carlos Carrera
Originally posted by Carlos Carrera
hahah i know what are bore and stroke. :cheers:
And i know that, with less stroke u can make a High Revv engine. But i dont quite follow the statment i quoted before about Torque / Power.

Michitakem
Originally posted by 89TTA
what? what isn't street legal about that? that WAS the stock intercooler... that was only a PT-49 turbo (stock replacement, and looks like the stock T29)... the only thing on the engine bay that has changed (that a cop can notice) is an added fuel pressure guage (which says 42 psi... and the motor wasn't on at the time) and an engine breather on the valve cap (which, if the guy knew the car, means that EGR isn't active, but what the hey, all american cars for the most part just have an oil cap there).


Sweet Turbo Trans Am. :pimp:

Dreamn
Originally posted by Carlos Carrera
hahah i know what are bore and stroke. :cheers:

all that talk for nothing, well im gonna go do us all a favor and take a long walk off a short pier, bye, :sombrio:

lexus1581
dreamn u have a car u could leave for me?

Carlos Carrera
Originally posted by Dreamn
all that talk for nothing, well im gonna go do us all a favor and take a long walk off a short pier, bye, :sombrio:
:awf: :sombrio:

Carlos Carrera
Originally posted by Dreamn
all that talk for nothing, well im gonna go do us all a favor and take a long walk off a short pier, bye, :sombrio:
try to jump off a cliff in a Subaru... :smoke:

911GT2
I'll try and make it simple. Torque is twisting force, as your piston pushes down on the crankshaft causing it to twist. Now, the longer the stroke, the longer the crankshaft travel must me, so it must have a greater moment arm (length at which the force acts upon). Since torque=force*distance, this allows for greater torque. But since the piston has to travel so far and the crank has such a great travel, they often run out of steam up high and therefore can't rev very well.

Small stroke but large bore allows for very high revs (F1 cars have almost no stroke, way more bore.

Carlos Carrera
Originally posted by 911GT2
I'll try and make it simple. Torque is twisting force, as your piston pushes down on the crankshaft causing it to twist. Now, the longer the stroke, the longer the crankshaft travel must me, so it must have a greater moment arm (length at which the force acts upon). Since torque=force*distance, this allows for greater torque. But since the piston has to travel so far and the crank has such a great travel, they often run out of steam up high and therefore can't rev very well.

Small stroke but large bore allows for very high revs (F1 cars have almost no stroke, way more bore.
DONE. I get it thanks :cheers:

911GT2
No prob.

Definitely recommend listening to the 4-rotor in the sound thread.

Dreamn
Originally posted by lexus1581
dreamn u have a car u could leave for me?

umm, sure, until i get back from my swim, :fro:

lexus1581
haha funny :bootyshak :curse: :finger: :badass: :flame: