Question about 1987 Chevrolet Camaro

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How do I select valve spring for JR Motorsports cam part #prc104?

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If the cam info doesn't specify I'd go to the Comp Cams website and find a similar grind. The Comp site will recommend a matching valve spring and I'd go with that recommendation to use with your JR cam.

Good luck.

Posted on Oct 16, 2010

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Ok 1990 geo storm 1,6 litre dohc replaced water pump replaced 3 valves replaced head gaskets replaced timing belt car wont start any ideas?


90 Storm, must be in Canada, 1,6 (the comma tells me this)
the storm is a:
The car is really an Isuzu Impulse minus some of that car's more expensive features.
my guess is you drove the this 4EX1 engine until the cam belt slipped. yes> if yes you bent valves.????????????
so does compression exceed 150psi on all 4 cylinders now?
we use the cylinder leak down test in all DOHC .
if not , back to the drawing board.
if yes, the we check spark next, then try test fuel.
when did the engine last run , last week,month , year,?
who did your valves, a real machine shop or kid down the street.
a read shop pressure tests the head ,and warp checks it and
then makes sure the valves are ready for long service.
are the head bolts at 58 ft/lbs
did you use sealant on the 3 cap caps, per the FSM book.
if not , top end oiling will fail. and cams wrecked.

the 1.6l DOHC has no HLA's
the lash on valves must be checked, and this is corrected with SHIMS.

a pro machine shop does the for you,did they:?
when rebuilding engines, its best to read the factory service manual first. FSM so you know the special steps just for this engine.
ISUZU engine it is.



quote.
1.6L Twin Camshaft Engine
  1. Disconnect the negative battery cable.
  2. Remove the cylinder head or valve cover.
  3. Position the No. 1 cylinder at TDC on its compression stroke.
The notch on the crankshaft pulley should align with the 0 degrees mark on the timing gear case. Make sure the rocker arms on the No. 1 cylinder are loose and the rockers on the No. 4 cylinder are tight. If not, turn the crankshaft one complete revolution and align the marks again.
  1. Using a feeler gauge, measure the clearance between the cam lobe and the selective shim on the intake and exhaust valves on the No. 1 cylinder, then the intake valves on the No. 2 cylinder and the exhaust valves on the No. 3 cylinder. Note readings.
  2. Rotate the crankshaft 360 degrees. Using a feeler gauge, measure the clearance between the cam lobe and the selective shim on the intake and exhaust valves on the No. 4 cylinder, then the intake valves on the No. 3 cylinder and the exhaust valves on the No. 2 cylinder. Note readings.
  3. The valve clearance obtained on the exhaust valves should be between 0.008-0.012 in. (0.20-0.30mm). If not, replace the selective shim by turning the camshaft lobe downward and installing tool J-38413-2 or J-38413-3 (valve lash spring spacer) between the camshaft journal and the cam lobe next to the selective shim. Turn cam lobe upward and remove the selective shim. Install new shim using the selective shim chart.
The rear camshaft bearing caps must be removed to remove the selective shim.
  1. The valve clearance obtained on the intake valves should be between 0.004-0.008 in. (0.10-0.20mm). If not, replace the selective shim by turning the camshaft lobe downward and installing tool J-38413-2 or J-38413-3 between the camshaft journal and the cam lobe next to the selective shim. Turn cam lobe upward and remove the selective shim. Install new shim using the selective shim chart.
  2. When the adjustment is completed, install the cylinder head covers and connect the battery negative cable. Start the engine and check for leaks.
end fsm quote.

see those 2 marks, and crank must be at TDC. mark first.

26196190-t50uqibptsz0ry0el5zdiz1k-1-0.jpg

May 16, 2016 | Geo Cars & Trucks

1 Answer

I'm having problems getting the rocker arm assemble to go back on and tighten down with out locking the cam where it will not turn at all and that is with bolts finger tight


When the rocker arm assembly is tightened down the lobes on the cam will be pushing the lifters which will put force on the push rods which will rotate the rockers which will open the valves against the valve springs. And,,,
That will create frictional resistance in the entire system, And,,,
Any rotation of the cam will require valve springs to compress.
I know that my old fingers would not contemplate trying to rotate it.
Cheers

Jan 07, 2016 | Cars & Trucks

1 Answer

WHY DO ROCKERS KEEP BUSTING 3.3 MOTOR


there is not enough spring travel on the valves The rockers used are incorrect for the cam used and the lift of the cam is making the rocker push the valve too far down and is binding up the spring. You may have something else wrong like extra spacers under the valve springs , valve guides not in far enough valve spring retainers not correctly positioned or wrong inner spring that is binding up. Turn the cam over carefully and see it the distance in the spring coils disappears before fully open the valve.

Dec 26, 2014 | 2000 Plymouth Voyager

2 Answers

CAN A IDLE VELVE CONTROLLER MAKE YOUR CAR CUTTING OUT WHILE DRIVING


It is called an idle air control valve (IAC), and it will cause stalling at idle or while decelerating to a stop, but engine stall while driving at steady speeds, no that will not be the fault of the valve.

May 17, 2012 | 2005 Volkswagen Microbus

1 Answer

Water pump / timing belt went out on a 97. When turning the cam gear by hand, shouldn't all the valves and rockers stay in contact with the cam. If they dont, does that not show that the valves are bent?


Yes they should. The best way to check without getting really technical is to check valve spring height when the cam heel is above the valve (not the lobe) All springs should be the same height. If a valve is bent it will not let the spring come all the way up because the valve stem will not pass through the guide.
A better way of checking is to connect a compressed air supply to each cylinder, one at a time and turn the cam so that the intake and exhaust lobes are not on the valves for that cylinder. If air comes through either the intake manifold or exhaust, that valve is bent.
If you have any bent valves and you remove the cylinder head, be sure to round over any "eyebrows" on the piston tops using crocus cloth. If you don't and the mark is pronounced, it can become a hot spot that can cause pre-ignition.

Jan 30, 2011 | Dodge Neon Cars & Trucks

1 Answer

Part requirments for Cam and lifters


Yes you will need the following:

Cam
Lifters
Assembly lube
Water pump gasket
Intake gasket
Timing cover gasket

Lifter removal tool
Puller for harmonic balancer
Cam installation tool/removal tool


I also would recommend replacing the timing chain and timing gears since you are going to have to take the timing chain off anyhow.

You will also need the associated tools to do the job, plenty off rachets, box wrenches and such.

If you are doing mechanical lifters you will also a feeler gauge to measure the valve clearance and make adjustments.

I cant think of anything else off the top of my head.

If you are doing a cam with more lift then I would recommend replacing your valve springs as well, it is easy and it will assure you do not incur valve float. You will have to take the rockers off when you install the new lifters because you have to remove the pushrods. I also recommend you replace the pushrods while you are at it, they are cheap. You will need a valve spring compressor and new valve springs and locks, they are pretty cheap.

Oct 29, 2009 | 1983 Ford F 250

2 Answers

New cam went flat in 30 min. 2nd cam wiped out also cams were crane hydraulic/ break in was followed.


Valve spring seat pressure too high, or valve lash too tight. In some cases a big-lift cam, with a stock set of springs causes coil-bind or "spring-stacking" and that will wipe a cam flat in about 5 minutes. Used lifters on a new cam won't seat properly, causing an uneven wear pattern. Doesnt take much to start a problem on a flat tappet cam, but hydraulics are usually more forgiving that solid lifters.

Oct 24, 2009 | 1985 Chevrolet Impala

1 Answer

Size of valve springs fo 289 ford engine with 302 heads


its not that easy here are some of the things u need to know

* solid or hyd cam
* roller or flat tappet
* valve installed hieght
* rocker ratio
* cam lift

this is just a few things go to a head shop and they will choose the right ones

Dec 19, 2008 | 1965 Ford Mustang

1 Answer

350 chevy small block


Aftermarket intake, camshaft and either a good set of heads or port/polish what you have. If you go with a cam, go with more adv. duration and duration and .050. I like running a .525 lift, .230 dur. @ .050 and .292 advertised duration. Get a good set of springs and valves. This cam should get your redline around 6200. If you're using this engine on the street, I prefer the Performer RPM with a 1" spacer. This provides plenty of velocity to the heads. If you can find a set of camel hump heads, casting number 041 you'll love those or have your heads ported. I'd run a Edlebrock 1407 carb. with this set up if you're using it on the street. If you're using this engine for strip duty as well, use a single plane intake like a Victor Jr. Professional Products have a nice selection of single plane intakes for a very low price. I've bought one myself and really liked it.

Jun 21, 2008 | 2008 Ford F-350

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