BADFNZ-383

iTrader: (41)

I got the new CHP in the mail today. they had part 2 of the intake manifold test. this time around they added a cam. the results are:

212/218 cam:

Truck Intake - 429hp/422 torque
Ls1-450/439
LS6-459/447
FAST-462/450

222/224 cam:

Truck-468/445
LS1-462/442
LS6-471/449
FAST-479/452

232/234 cam:

Truck-486/447
LS1-484/445
LS6-495/448
FAST-503/452

PendragonZ

So the LSX intake is only pulling away from the pack on bigger cams. Interesting.

rookie501

iTrader: (2)

But those few extra to me, do not justify the price.

Whitten

iTrader: (1)

All about flow. The LSX is great with increased demads for air. The LS6 will begin to choke out the engine because it meets it's volumetric efficiency earlier than the LSX. That is why the LSX is recomended for people with increased displacement, larger valves, increased compression, heads cam packages, and large duration cams.

marc_w

There's quite a different between the truck intake, and the rest of the pack, with the 212/218 cam.

Which 212/218 cam did they use - hi or low lift?

I might look into swapping my intake out...

Henry D

Very well said.

Henry D

Comp Cams XR265HR
0.522/0.529-inch lift
114 LDA

DJ_951

like how they used roller rockers too. must have found them in the back of the garage. makes the dyno numbers from before hard to compare to adding a cam.

Got the mag for another year for the '75 restoration/build-up for cheap. This month they work on the front suspention. I was hoping on some good stuff for restoring the old ride. Nope, buy all new stuff including drop spindles and have someone install the stuff. Great, could have got that from a Hyans manual.

Think its time to try another mag next year. Think I'll start my own, restoring the beater and drivers

Henry D

I can understand how you feel. However, you also need to understand that we have to make the most of our limited dyno time. Trying to repeat the test and then do it again with a set of rockers would be impossible from a cost standpoint. Regardless, the test is valid and shows the kind of gains you can expect to achieve.

Still, I dig wrenching on these engines, so if you'll pick up the dyno tab, I'll be more than happy to do it. Either way, I certainly appreciate your input.

Regards,
HD

Fulton 1

iTrader: (9)

I found it interesting that the truck intake bested the LS1 intake with the bigger cams. I'm far from an expert, but I wouldn't have expected that.

777

iTrader: (21)

i never realized that the ls6 intake was that much better than the ls1 intake

Weave

In regards to the truck intake being so different on the 212/218 cam (and basically the same as the LS1 on the others), it would be nice to see the power curves for each cam all on the same respective graphs. There's more to these combos than just peak HP/TQ numbers. I'd bet that the truck intake's curve is shifted "lower" than the others due to its longer runners and its design intent for truck applications. If that's the case, it may actually be the better intake for street applications. Peak numbers are great for bench racing, but it's those average numbers and the area under the curve that really matter.

Edit: I just read the last sentence of the "text" portion of the article - it says complete dyno graphs and average numbers can be found at chevyhiperformance.com. However, I can't find the link on that site - the "This Month" section still has last months mag. Anybody found the link yet??? Henry D, where'd you hide it at???

-Weave

BigBronco

iTrader: (2)

The ls6 intake is very good... like stated, it reaches its efficiency point of making power earlier then the lsx intake.

here are the pros and cons about lsx

Cons

with cam only motors, unless you spin the motor to a very high rpm, you will see no difference then the ls6.

If you have a bolt on only motor, stick with an ls6

to get max power from a car with lsx, you need a reason to flow air through it, so with that said, to see the bad *** side of the lsx, you will need added cubes, or FI, or a high spinning Heads/Cam and even spray motor

Pros

you can get very good flow up top

only thing better flowing after the lsx for big cube motors, are sheet metal intakes

tell your wife that since you purchased your intake, you now need more cubes to get it to work right


But bad thing about the FAST intake and throttle body is that it lays a HUGE punch to your wallet.....

But we keep lsX intakes in stock and people are buying them. With them on our cars that run on our chassis dynos, we have got results that are the same as the engine dyno results. Down low on heads cam cars, numbers are similar with the ls6 intake, but once you get into 5,000 greater, the lsx pulls away....


Gray

DJ_951

[QUOTE]Short intro

Just wanted to say hello and introduce myself. I've been lurking the board for some time now and looking fwd to contribute to the community.

Best regards,
Henry D
Tech Editor
Chevy High Performance nice to see you on the board

BigTex

iTrader: (16)

I agree, Welcome aboard Henry D. I have a question for you. With the big cams, the truck intake made up alot of power compared to the small 212/218 cam. Is this a peak only gain, or full gains across the rpm range? At the lower rpm levels, how does the truck intake compare in torque VS the other intakes?

I'm going to find that mag during lunch. I'm glad you followed up that article CHP.

Richard

----

I 99% sure that the runner lengths between the LS1/6/X intakes and the truck intake are nearly identical. The truck intake does flow into the head at a different angle though.

jrivera04

What year Z came with the ls6 intake? Some people on this site 2001 and 2002 and some people say they never came with a ls6 intake.

DJ_951

'01 & '02

Gremlin5.3

I'd like to see the whole graphs too.

jimmyblue

iTrader: (11)

I didn't see anything indicating the LSX being the
"big boy" 90mm so I reckon it was the smaller TB
and inlet version. So that makes it only runner
differences and still it shows w/ the bigger cams
on same heads.

Henry D

[QUOTE=BigTex]I agree, Welcome aboard Henry D. I have a question for you. With the big cams, the truck intake made up alot of power compared to the small 212/218 cam. Is this a peak only gain, or full gains across the rpm range? At the lower rpm levels, how does the truck intake compare in torque VS the other intakes?QUOTE]


I just took a look at the numbers and the truck manifold did remarkably well across the entire rpm range.