gear ratio & cam profile

[dragline708]

I was wondering , what the specs were.
Kind of rolling around in my head info , compared
to say a 350 chevy with a 350 trans , now this family car average
220 -250 hp car ..... not a 300 to 350 hp version muscle car type.
First , I like what I'm seeing from a mechanics point of view :wink:
350 car vs----------- Rocket
Cam profile vs------- Cam profile
int dur 195 vs ------ int dur 220
exh dur 200 vs ----- exh dur 232

Ok for the not so mechanically inclined what this means.
take your average 350 chevy engine 350 automatic trans 3 speed
A Cam Profile general rule of thumb when duration exceeds
222-225 on int valve you better start thinking about getting a STALL
CONVERTER for trans ( high stall more slip ) so when you put it gear
it will not bog down engine idle & almost stop it from running
you'd either have to compensate by ( holding in clutch ) or for automatic trans kick gear shift level in neutral
SO the rocket cam profile is @ the bottom of the hi performance
food chain cam profiles, which IMO is good
any more and these things would have to be done
1. compression raise
2. 3 angle valve job & valve bowl work
3. a stall converter BUT its already a stick shift :wink:
OK NEXT Trans gear RATIO'S & final drive RATIO

350 chevy350 auto trans -------- Rocket
1st gear 2.53 --------------------- 1st gear 2.92
2nd 1.53---------------------------- 2nd 1.94
3rd 1.1 ----------------------------- 3rd 1.43
----------------------------------------4th 1.16
----------------------------------------5th .964

Modern 700r4 trans with over drive
1st 3.06
2nd 1.63
3rd 1.1
4th .75 over drive

FINAL DRIVE = REAR end gears in car
350 chevy ---------------------- Rocket
old gear ratio's ------------------ 2.84
with out overdrive trans
2.73
with over drive trans
3.08
What does all this mean above basically
the rocket gear ratios pull hard then your average car
and convert the hp better
The cam is @ max before you start getting into really
high performace issues
Need less to say you already found out its a winner
combo :wink:


my2cents
wayne

 

[dragline708]

Hombre,
A cam profile with more duration on
exhaust event is better for force induction engines
which the rocket has already.
Usually on a split duration cam there is a 5 or 6 degree split
example Int valve 220 dur @.050 lift
Exh valve 225 dur @ .050 lift
So with the Rocket having the extra 6 or 7 deg duration on exhaust
int 220 exh 232
The engineer who had a hand in designing Rocket engine
cam profile IMO was a performance nut like we are,
and knew what was coming :wink:
IT'S GOOD TO GO :!:

ps: The roller cam I designed was int valve 258 dur@.050 exh valve 266
___int center line 103 exh centerline 113 = 108 centerline
___ using 1.5 roller rockers on intake valve 1.6 on exhaust valve
___ gave me .600 lift int .630 lift exhaust
___then had Crane Cams cut if out of a billet
___ you defintely Do Not want to go that radical :wink:

PPS: REMEMBER stay below that edge :lol: :lol: :lol:
there are better but you still want streetability



My2cents
wayne

 

[dragline708]

Hombre,
I rode my rocket to car show just to see my
old anglia, talking with new owner.
He said , **** everyone keep asking me,
what kind of cams in that thing. I gave him
the cam card with spring rates etc etc , when I
sold it and a book 2 inches thick with details
parts #s everything **** near as entricate
as a rocket shop service manual.
He just drives it @ 55 mph he's scared to death
of the power it has :lol: :lol: :lol:
It will smoke a rocket maybe even one
with a supercharger :wink:
I miss the old girl, she was 1 of about 400 regsistered
anglia streetrods through out the U.S.A
Hopefully it will still be around when I'M long gone

my2cents
wayne

 

[owl]

I really wish I understood this stuff - I really do

 

[owl]

Trouble is I don't know enough to ask a sensible question. Truly.

It's something I regret.

I've never had a technical leaning - nothing in that direction passed on from my father or friends either.

 

[dragline708]

Hombre,
I Just can't bring my self to tell you.
I know you all to well , you take my knowledge
then add your knowledge to it.... computer skills etc
You'd surely slip over the EDGE of streetability
and whine up with a 800lb paper weight.
I have been there... once playing around with
nitrous oxide & my quest for more power
I lifted the heads both sides and entirely blew
head gaskets out of the block while also running
nitomethane fuel.
I use to go through master bottle 60 lbs of nitrous
in a single night.
Built my own filling station
Bought my own deep freezer
weight scales
bottle rackets
jumper lines etc
Horse Power freak never stop, the only thing slowing me down
now is arthritis
You'll be more then happy :wink:

my2cents
wayne

 

[dragline708]

talltx,
your right about 8.3 lift
valve diameter 37.90mm int
32.30mm ex


WAYNE

 

[dragline708]

**** IT,
Hombre I just sent you a PM
trying to be very conservative recommending
a .470 lift cam now you tell me you'd be happy with a .380 or .390
lift , I 'm going to have your arms draging 3 feet behind you.
Carillo's are great but they are huge Aluminum rods a lot of block work
sometimes has to be done to run them.
polish exhaust port runner in head, maybe polish both valve bowls
intake & exhaust , take off edge of seat lip on both int & ex valves.
IF you get a new cam profile tell them ( cam maker ) what rev limit
& lift you want & dur, int & ex valve , they will give a spring rate recomendation and can order both same time .
LET'S SEE
( balance everything )
1.we can get the crank knife edge & mally metaled plugged
2. chamfer crank oil hole
3. off set grind crank ( stoker motor )
4. fly cut valve reliefs ( pistons ) wiseco ( $1000.00 ) plus
5. titanium valve retainers ( $ 1000.00 )
6 . titanium rods ( $ 5000.00 )
7 . side clearance block for stroker crank
8. Extude hone head work ( $ 2000. 00 )
9. over size sodium filled valves stainless guessing ( $1500.00 )
10 chamfered crank bearings
11. 750 lift cam 308 dur int 320 ex
12. 6.75 compression pistons so can run 18- 22 lb boost
13. 5 core intercooler < injected water mist out side spray bar :wink:
DO you truely want a ROCKET
I can make the list longer

Wayne

 

[Jimmy Rocket]

I'm trying to follow this stuff. But there's this pain between my ears. . . . Maybe I wasn't cut out to be an engineer. All great stuff, though (I think).

 

[humble]

This stuff ROCKS.........................c'mon....................Hombre & Dragline......................don't stop now!

I might not ever be able to afford all the goodies Dragline has spec-ed................but....................would anything even close be a kick? :twisted: