JS

iTrader: (4)

No Predator,it was a 3365lb car with a 4200 stall

FWIW,
I also went 11.46@117 in a 3500lb car with a 218-224 and a VIG3600


I was just adding alittle humor to the post...
Geez,I got scolded by the Predator

Futral

iTrader: (1)

Patrick,

You make me all warm and fuzzy inside everything I see you compare my F13 to your TR whatever

None of our cams are a R\S design! You just can't go by .200" numbers either. If you want to go by lobe area,then it would be considered a single pattern since they are they same-29.98\28.03

Geez!

Cstraub

iTrader: (1)

No but I have six track champions going to the Boone IMCA nationals that I know of. Your right I don't have a 10 second car, but I can get my boat on plane in 10 seconds with 7 people.

No flames intended. I will make my point. COMBINATION. It has been said time and time again. With the Net and other channels of info the public has become more informed. This leads to better decisions on combos.

Now budget plays apart. Depending on what you have to spend will dictate how you spend it. Some guys will spend $900 for just cam and lifters where as others will get cam lifters pushrods and timing set for $800. The solid and hyd cams in those IMCA cars all were sold to the racer for $300 or better by my customers. Thats alot of money for a cast cam, but it was a part of getting them to a track champion. Will there be off the shelf stuff running with them, sure.

Time frame. Some people don't have time for trial and error testing. They want optimized combinations from nearly go. Aquiring the help of someone who has a reputation of "getting it right" the first time for some is a wise investment for dollars spent during a time frame. Sure some have gone 10's with shelf stuff out of the box but they happened on a good combination. On the flip side many more have failed and spent alot of money to finally get there.

"Who runs your stuff?" I get this alot. Hell I don't know. I have several engine builders that I work with in drag, circle, marine, and truck pull. None are big names but all have championship caliber engines. None of them care that the fastest thing I have in the garage is a '99 Z-71. They all care that I deliver the power they want with the camshaft I sell them. Thats it. One of the top lobe profile engineers in the business I know for a fact can not operate a cam grinder, but I still have the utmost respect for the man.

Again, not singling you out, just took your post to say, at the end of the day, if your combination does what you set out to achieve then you have a good combination. . . shelf parts or custom parts.

Chris

JS

iTrader: (4)

Cstruab I totally agree.....COMBINATION is the key....
I was just havin alittle fun,things are slow around here and wanted to liven it up

Fogle07

iTrader: (5)

what about the tr227? is that a good cam? i sure hope so cause i got one sitting behind me on the shelf

JS

iTrader: (4)

Its a great cam.....

Fogle07

iTrader: (5)

think its great for a truck? im going with a tci 3000 stall. i also have some long tubes, 3.73s,bbk 80mm tb, nelson tune, shift kit, electric fans.

Patrick G

iTrader: (14)

Actually Allan, you should be flattered by all the attention your products are getting these days. People are hauling *** with them. The purpose of my post is to have people remove the blinders of looking only at duration at .050 or only lift and start concentrating on picking the correct valve events that benefit the combination of parts they're running. Lobe area, ramp rates, valve timing...all have a dramatic effect on the total package...but you already know this...it's just that not everybody on this board does.

Patrick

Fogle07

iTrader: (5)

patrick,what does it mean when a cam has a fast ramp rate?

Patrick G

iTrader: (14)

It means that from the point the cam lobe first starts registering measured lift (at .004" or .006"), the acceleration (in degrees) of getting to .050" lift and .200" is faster than than cams with slower rates.

Put another way, take 2 cams with the same duration at .050. (224 degrees)

Cam 1 has slower lobes:
Duration at .006" is 281 degrees, duration at .050" is 224 degrees, duration at .200" is 139.

Cam 2 has faster lobes:
Duration at .006" is 273 degrees, duration at .050" is 224 degrees, duration at .200" is 146.

So you see, cam 1 took 57 degrees to get from .006" lift to .050" lift and 85 degrees to get from .050" lift to .200" lift.

cam 1 took 49 degrees to get from .006" lift to .050" lift and 78 degrees to get from .050" lift to .200" lift. That's a faster ramp rate. The valve is accelerated faster.

Fogle07

iTrader: (5)

so which would make more power. faster or slower ramp rate?

JZ'sTA

iTrader: (23)

typicially the faster ramp rate but not in all cases. Faster ramp rates can also help driveability. Using the 224 as Patrick was using there are a number of different cams all with a 224 advertisied duration. Many have different advertisied lift and different ramp rates. Hell TR offers at least 3 different cams all with a 224 advertisied duration at .050. IMO I perfer the 224/224 581/581 over the more common 224 cam thunder sells.

JS

iTrader: (4)

I like Thunders lobes/ramps/idle quality..
Area under the curve is IMO 2nd to none....

gollum

iTrader: (1)

What kind of wear effects do fast ramp cams have on lifter bores and valvetrain because of the high tension valvesprings that are required. Has anyone witnessed any excessive lifter bore wear, valve stem and guide wear, rocker arm wear etc? GM knows there is a limit to how fast a cam should open and close for a given application. What is that limit?

PREDATOR-Z

Good point, this is why I am an advocate of 918 beehive spring for XE-R lobes.
If a little more seat pressure is needed, shimming the 918's will get you there.
Many poeple just say get Duals with excessive seat pressures for extra safety, but the catch is that by doing so, you better change your lifters too.
Duration has a big effect on the lifters too, a smaller duration high lift, fast ramp cam is way easier on the plungers than a cam that hangs it open forever.
Finally this is where the effective moving mass of the valvetrain becomes very important. The lighter it is the less work your lifters have to do > the less wear on them.

Fogle07

iTrader: (5)

ok. i got the tr227. will this be a good cam to use with my 918s that are on the way? on there website the specs are 227/224 .569/.563 114LSA.

gollum

iTrader: (1)

In some cases Compcams 915 springs are enough. Check out these cams and their recommended springs here. www.nitrousexpress.com

PREDATOR-Z

Of course, I've ran cams up to .610 lift on 918's with no issues. correct geometry is essential.

Slacker

TR227 & 918 springs works good for me.....

Fogle07

iTrader: (5)

slacker. when does this cam start to pull hard?