C3Vettesrock

How does it work and what information is needed?

CDaniel525

it pretty cool....not sure how it works but is pretty accurate....I see you have a zz4 and as do i, and i entered in all the info from it and came out pretty damn close

the 2 things you need to really need to know are your head spec and cam specs


However, its not worth teh $$ if you already have a motor...i would only get it if you were building a motor from your specs

Chris

C3Vettesrock

I was hoping someone with it could run my info into it. I just put zz4, dad wouldnt let me get hotcam. I thought i should have been allowed to get it since I payed for the whole thing, it was like $300 more for 395 hp, sounded good to me. But he said a 16 yr old doesnt need 395 hp. So I figured I would have to settle with a measly old stock zz4 :lol: Anyways I just put the engine in and ran a whole new exhaust system. Was wondering what specs they would need to run it if anyone would do it for me. Would really appreciate it.

1979toy

It works OK as a tool to decide on cams as long as you understand that the program has a number of limits that prevent you from putting together an engine combination from scratch. The program assumes perfect timing and carb tuning throughout the RPM range (don't we all wish). Intakes are limited to type, ie dual plane, tunnel ram. Carbs. are treated the same a 600 CFM carb is just that, not vacuum secondary or mechanical. No inch diameter for the exhaust, just duals or open headers and some other choices.
Information needed is;
Cubic inches
bore
stroke
number of cylinders
type of cylinder head - low performance, pocket ported, ported
valve sizes
compression ratio
Carb CFM
manifold type
exhaust type, headers or stock
camshaft
lifter
ALL cam specs.

If anybody knows of a program to sort out carbs and intake manifolds please let me know.

QuickVet

you power should be the same as the stock ZZ4, mabey a few higher. i believe the power rating on the ZZ4 was made from the factory with headers on the motor. so the exhaust, IMO, wouldnt make much differnce than the factory rating.

CDaniel525

gonna have to agree with vetteboy...not much of a difference through small mods

Chris

C3Vettesrock

Id like a dyno sheet if it isnt too much trouble, and i want to see the diff with a new cam

QuickVet

i will try to do one for you tommarrow :yesnod:

DeenHylton

A desktop Dyno program as well as a quarter mile program are as important as any performance products you may purchase. You can get both programs for around $150. total...less than a carb, cam and kit, gears, etc. You'll find that the carb you just HAVE to have may only make a couple HP difference or that set of gears actually SLOWED you down in the quarter mile or made only one or two thousandeths differance ET. If you like to tinker as I do those soft-ware programs are as important as the torque-wrench in your tool box. Just my .02
P.S. If you don't have the money right now...it's the right time of year to put them on your Christmas list!

QuickVet

i couldnt figure out how to post copy the dyno picture from the program. sorry :( but i compared a zz4 with a set of small tube headers vs. large tube headers and found a ten horsepower differnce. i can up with 357 vs. 367.

rainman69

Do you have flow numbers for the 463 heads on a ZZ4? Also, how is the cam installed (110, 112, etc)?

QuickVet

these are the numbers i have been told are for the zz4 heads:

lift intake exhaust
.050 29 27
.100 56 49
.200 120 96
.300 160 123
.400 186 140
.500 196 155
.600 199 159


for the cam it should be a 112 centerline

rainman69

So, when DD2000 comes up with negative valve overlap...that's correct for this cam?

QuickVet

no, mine doesnt have any negative numbers. what did you put in the fields?

rainman69

Did I just read something wrong off the cam specs on the ZZ4 page?

daniel77350

you know what else is fun...bethesda's Burnout:p:layers Choice Edition. They don't make it anymore(stupid morons)...anyway, its a fun dragracing game, you can play it online, and build drag cars from the suspencion to the engine to the wing on the car. It can be a dragster, funny car, or stock car. They only have one vette...a '53....

There is also bethesda's Burnout: NIRA version. It comes with imports in the game, but you can import american cars from Players Choice Edition. The plus about NIRA is you get the option of turbo's and superchargers...its fun to play with and race online...but its not very popular anymore. It uses the same technology as desktop dyno for the engine...and in fact you can import desktop dyno engines into the game.

Daniel

QuickVet

i have mine on seat to seat.

how did you copy that image so you could post it?

rainman69

Alt-Print Screen does a screen capture. Then you can edit it in a paint program.

The ZZ4 page lists the 208/221 at .050 lift...not seat to seat...

QuickVet

from the performance parts catalog i got these numbers:

crankshaft duration at lash point degrees= I:309 E:316
crankshaft duration at .050" tappet lift degrees= I:208 E:221
max lift with 1.5 rocker ratio= I:.474" E:.510"
valve lash= Zero/Zero
Lobe Centerline degrees= 112

this is a Hyd. roller tappet. (i put it in as solid cam because it is not really a true roller, but who know what should really be put in?)

rainman69

Ok, I think that they screwed something up...because the seat to seat (309/316) versus the .050 (208/221) is hugely different.

Strange. :smash: Posting a new graph shortly.