Andrew,
The main problem with rocker breakage is caused by lifter pump up. When you
get pump up the rocker pops out of the lash pad and often snaps the rocker
arm while doing so. If unlucky it may mash a valve into a piston at the same
time To cure the problem there are solid lifter sets and also rocker savers
that limit the rocker side movement. I fit up inner valve springs as well.
With this setup 8500rpm is no problem.
There are no cheap replacement rockers I know of. A good windage tray is
always worthwile. The stock SR setup is good but can be improved.
Cheers
Feral Errol
mailto:[EMAIL PROTECTED]
http://www.datrats.com.au/
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of andrew smith
Sent: Saturday, May 05, 2001 1:19 AM
To: [EMAIL PROTECTED]
Subject: Re: Power output of a Fj20det?
Errol,
I know what you mean by a problem with the Sr20 rocker setup as I have seen
quite a few with broken rockers.Most of these had been in fairly modified
SR's
that had been reved hard although one had the data log info and indicated it
was being reved to around 7800 max.The stronger after market ones ive seen
sell for
more than a front cut.Have you seen any cheaper ones around as I could be
looking for some shortly.The blocks can also be a problem but ive seen that
nizpro use steel wedges between the cylinders.Ive seen one SR have a melt
down between combustion chambers but believe this was probably caused by bad
detonation as indicated by the bigend bearings.Dont get me wrong I still
think the SR's are a good motor but like all motors have there
limitations,some of
which can be overcome at a price.The FJ20's dont have the same valve train
and block problems although one guy tells me he has thrown the odd shim at
over 9000
rpm luckily causing no damage.I reckon the Fj20 is probably has the best
potential for dollar spent.I would definately fit a good windage tray though
as
ive had problems in this area.My opinion. Andrew Smith
Errol Smith wrote:
> Wojee,
> At the same capacity I think the CA would make the same as an SR in stock
> form.
> The chambers are identical with the CA having a slightly shallower valve
> angle so larger valves are an easier option. The buckets and shim system
is
> better than the SR rocker setup but SR's have a lot of good bits now that
> can make them able to run up past 8000 rpm safely.
> Both DET engines have a girdled crank.
> If forced to choose between the two engines I would run with the CA due to
> its light weight and high power capacity for its displacement.
> The port area on the SR is bigger than the CA so probably allows greater
> outright development potential
> My two cents worth
> Cheers
> Feral Errol
> mailto:[EMAIL PROTECTED]
> http://www.datrats.com.au/
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Wojee
> Sent: Friday, May 04, 2001 12:13 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Power output of a Fj20det?
> Guys, I would love to get a hold of a ca18det out of say a silvia or
180sx
> (i would buy the car with the motor ... duh.. hehehe) and put in a crank
> and rods out of a 2 Litre, (possibly FJ20 T ????) and I would love to
see
> the numbers it would make with as standard everything else...... ie AFM,
TB,
> intercooler + plumbing, injectors, computer (if it will handle the
increased
> capacity) So i have done nothing else but increase the capacity a little,
> and compare it to a equally standard SR20DET equivalent. I think , like
> Andrew says, that they are under rated.... I actually like the valve train
/
> actuation of the CA compared to the SR........... Although I am
wondering
> what the port sizes (inlet/exhaust) are compared to the SR??? Basically
> what i am chasing is to find out if the both engines had the same capacity
> would the power output be the same.... standard engines... no boost
> increase.... Bottom line if they produce the same hp ( allow 5%
> difference) ..... both at 2L capacity ... I am getting a CA18DET and
> stroking it!!!!! hehehehe
>
> I haven't typed a reply for ages so i get a little excited as you can see.
> hehehe.. seriously though... what do you fellas think???
>
> Wojee :O)
>
--membersozdat-------------------------------------------------------
OZDAT Mailing List Please Note:-
Send (un)subscribe requests to [EMAIL PROTECTED]
Send submissions to [EMAIL PROTECTED]
No unauthorised redistribution of this email
http://www.ozdat.com/ozdatonline/index.htm
http://www.ozdat.com/ozdatonline/listindex.html
http://www.mail-archive.com/[email protected]/
---------------------------------------------------------------------
