Sliding

I've finally started the car, after almost seven months :eek: .
At first it wouldn't start at all so I turned distributor a little and it started.
I've noticed that valves are very noisy.

Where should I set my timing with this cam ( LPE 74219 )?

AS84

mine runs best with about 8 degrees base

Sliding

I've tried to set timing with timing light and I can't see mark
anywhere near the scale :confused:

What could this be?

Sliding

Yeah, and I've tried to drive the car a little bit and it runs like crap.

clemsonvette

the first thing you need to make sure of is that your advance is disconnected to set your base timing. if that is unplugged you should be able to move the dist and set the timing, if it is out of that range then you might be a tooth off. you really need to get that timing set before doing much else. and yes, timing will make it run like absolute garbage. good luck :steering:

Sliding

O.K. I took the distributor out again and started the whole procedure
all over. Started the car and it's not better.
Noisy valves, bad throttle response, timing mark way off ATDC.
If I try to set it right engine dies.

:confused: :confused: :confused: :confused: :confused:

Bruce

if it is that noisy as you say. Then it definately something is wrong. You need to look carefully all over again. I ran the 219 cam on my LT1 before and so are many people here have, no problem what so ever.

The noise you talk about, I bet ya your valve train are not properly installed or loose adjustment.. If it run rought than your TDC is way off. you need to confirm the 2 I mentioned.


Bruce
Cog set up is come by next week
93LT1 Conv w/ZF6
Blown D1-SC/N2O
ARE built 383ci/Stage II heads








[Modified by Bruce, 9:00 AM 8/2/2003]

Ramanstud

:yesnod: TDC will be just after the intake valve of the #1 cylinder closing. If you don't check for valve movement to verify... you can wind up being 180 degrees off. I wouldn't think that it would catch at all in this condition, but if you're going nutz with the distributor until it starts then.... Is the balancer new?

Describe running "like crap." Is it just choppy, or does the motor shake violently? Did you sent the valve lash according to the "book?" Got your plug wires in the right order? Double check them. New plugs, fully seated distributor, etc?

Good luck, but be patient- I know this will get really frustrating really quick. Just don't do anything rash!

:banghead:

Edited for clarity and: you;re not trying to run that 219 through the stock TPI intake are you???


[Modified by Ramanstud, 10:36 AM 8/2/2003]


[Modified by Ramanstud, 10:37 AM 8/2/2003]

Sliding

Here is how I did it step by step:

- installed cam "straight up", crank pulley at 12 o'clock cam pulley at 6
- adjusted valves, zero lash + 1/2 turn
- rotated engine till #1 is on TDC on compression stroke
- since valve covers were allready on, I determined compression stroke
by turning engine with finger over spark plug hole
- installed distributor so that rotor was pointing #1 on dist. cap
- installed wires from #1 in firing order clockwise

Nope, but I've checked timing a few days before I disassembled the engine
and it was straight at 6*BTDC.

It's choppy, not violently but choppy. Throttle response is not very good when
standing, but when driving it's awful, first when I push accelerator it
stumbles, then it starts to pull but nowhere near like it used to pull
before.

For now it's with stock intake but with ported plenum and intake base.
I will go with superram later, when financial's recover.

Sliding

Here is list of everything installed and done with cam change:

- LPE 74219 cam
- CompCams valve springs that LPE sent with cam
- titanium retainers
- ported stock #113 heads
- stock valves & guides
- machined valves and valve seats
- Crane teflon valve guide seals
- Hooker 2151 headers
- all Fel-Pro Perf. gaskets
- CompCams timing set with 3 positions ( 0*, 4*R, 4*A )

The engine was working very good before cam&heads job.
Quiet, excellent throttle response, pulled really hard.

Oil consuption from on between exchanges - 0.3 - 0.5 liter.
That was every 4.5k miles.

Ramanstud

- since valve covers were allready on, I determined compression stroke
by turning engine with finger over spark plug hole
____

I think you got lucky that way. I believe there's about a 50/50 chance of getting the distributor on 180 degrees out of whack... but I don't know if it would run that way. When you set timing, you need to physically verify TDC by looking at either your cam/crank marks or the valvetrain. Since there are TWO points of TDC for each piston in a 4-cycle engine. Others can say whether or not it would even run that way (180 degrees off), I do not know. It's pretty easy to pull a valve cover... why take the chance?

My guess is that you got lucky on the timing, but your TPI unit is way overcammed. It just doesn't flow enough air to smoothly run that kind of cam- but again another extrapolation on my part. It is probably also a combination of a rich/lean mixture in an over-camed, under fed setup. Any black or white smoke when you rev it? You may need to adjust the fuel pressure to 'get by.'

I would be surprised if you had much drivability at all, but again this is a hypothetical on my part. :D

:lurk:


[Modified by Ramanstud, 12:16 PM 8/2/2003]

scorp508

What kind of rockers? Are they rollers? Did I miss that part? Loose roller rockers are noisy as hell. I'd get the timing set right before anything though. Can you just plain not see the mark or is it just way off? If its like 40 something degrees off you might 1 tooth off on the distributor.

Sliding

I'll pull the valve covers down anyway to check valve adjustment,
then I'll be sure when #1 is on firing.

BTW I borrowed timing light and timing is 53* ATDC :eek: :eek: :eek:
Could the engine run like that???
There is probably something wrong with this timing light.

scorp508

I bet you're a tooth off too forward then. :yesnod:

8 cylinders = terminals 45* apart from each other. When you lined it up with #1 had it seated down on the oilpump driveshaft yet?


[Modified by scorp508, 12:26 PM 8/2/2003]

Sliding

No, I have reused stock rockers.

I'm at 50* ATDC, how is it possible that car is running like this?

Sliding

Yes it was all the way down.

Ramanstud

EDIT: I'm just going to sit here and scratch my head.

:blueangel:


[Modified by Ramanstud, 1:39 PM 8/2/2003]

Sliding

Yes, the advance wire was disconnected.

I'll be right back with a few photos.

Sliding

O.K. here is the latest situation:
I retarded timing a bit and its now at 37* ATDC.
Engine runs even worse, noisy valves, bad throttle response ....

I turned the engine at #1 firing position, timing mark is at 0*
and here is how distributor is placed:





What do You think?

Bluevette85

I'm having trouble with the first two steps above. After the first step, how did you adjust the valves? I would have rotated the crank until both marks were at 12 o'clock which should be TDC for #1. Then install the distributor, then adjust the valves. I used this tech tip: https://www.corvetteforum.com/techti...=142&TopicID=5


[Modified by Bluevette85, 2:24 PM 8/2/2003]