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Old 03-13-2003, 06:52 AM   #1
saturnmanSC2
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Default valve job

what exactly is a valve job. 3 angle and 5 angle? What does it do performance wise?

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Old 03-13-2003, 10:21 AM   #2
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The 3 angle valve job means that three angles are ground into the valve and the head. This would give the valve 2 edges, one for each time an angle meets a grind on the head. Each edge on the valve then has a coresponding suface on the head, which is contacts to make a seal. The more seals the less power lost to leaks around the valve. It is also argued that since the valve is better shaped then the classic 2 angle job you get less restriction for intake and exhaust.

5 angle valve jobs are really the same deal, but use 5 grinds. This makes a total of 4 seals. 5 angle vavle jobs are frowned upon for engines that are daily drivers because the works cost a bit more, for little imporvement and the jury is still out on if the 5 angle valve job has wear issues, sinch each grind is smaller.

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Old 03-13-2003, 03:22 PM   #3
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i've heard of 5 angle valve jobs, but what about a radius valve job? how are these,performance wise?

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Old 03-13-2003, 03:24 PM   #4
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so waht about a power increase? anything noticabel? I guess if you had intake and exhaust it would meen more right?

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Old 03-13-2003, 06:44 PM   #5
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do some porting on the head, and a valve job, and mill the head while you're at it, that will give you some power,but i don't know how much

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Old 03-13-2003, 08:13 PM   #6
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Default angles

Stock valves are angled at 45deg along the edge where they contact the valve seat to seal of the combustion chamber. the idea of a multi-angle job is to provide a smoother path for the air to flow around the edges. This will provide a small power increase. Porting the heads will have a bigger increase.

I am having my head done in May and I will be installing Stainless Steel cutback valves so I will let you know how it goes.

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Old 03-13-2003, 09:49 PM   #7
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thanx. and how much does al this cost. i work at a place were i get 50% off labor and 20 on parts ect, so i thought it would be worth while to do something that is labor intensive as thats what i save on the most. I would like to here how the new head goes too. thanx

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Old 03-13-2003, 09:59 PM   #8
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Cost can vary GREATLY. My local machine shop charges me $125 for SOHC, $150 for DOHC if I bring the parts. This includes, hot tank, "standard valve job" new valve guide seals installed, check for cracks/warpage. New valves (if needed) are extra.

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Old 03-14-2003, 06:27 AM   #9
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i could deal with 150$. I stillwunna know what exactly ill get out of it hp wise. i think im gunna do it though.

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Old 03-14-2003, 10:29 AM   #10
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Without exstensive porting and polishing work and assuming the bottom end of the engine is "like new", a "standard" valve job will get you back to square one...the output of the engine (+/-) when "new"

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Old 03-14-2003, 02:28 PM   #11
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really.... so it wont do jack is whaqt your telling me? What about the porting & polishing? why would anyone do that then if you dont get anythinb out of it?

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Old 03-14-2003, 03:02 PM   #12
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Porting and polishing will give you a substancial increase, but i don't know if it will get you what XRC claims there Heads do... which i 40-50 more HP to the Wheels

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Old 03-14-2003, 03:33 PM   #13
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I think that's a bit optimistic. Did I say a bit? I meant very. With a high-perf ported/polished/shaved high-compression head, you'll get around 10 horsepower. Maybe 15 if you're lucky (experts, sound about right?)

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Old 03-14-2003, 03:42 PM   #14
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Probably. I can almost guarantee you ain't gonna get no 50 hp tho

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Old 03-14-2003, 09:54 PM   #15
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Porting and polishing (done CORRECTLY) improve the flow of air into, and exhaust out of, the engine to build power. Notice I said "done correctly". Beware of published "Horsepower gains" that are not backed up with a dyno test results...you can tie 50 horses to your car and gain "50 Horsepower" but it won't net you anything when you go to drive it.

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Old 03-14-2003, 10:26 PM   #16
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still if i gained 15 hp i would be thrilled. If i gained 50. well i would gain 50. I havent asked the dudes yet but so what your all saying is. If i get my head, ported, polished, and (shaved? not exactly sure what this is either). i will get about 10-15 hp. all for around 150$ ish (remember 50% off labor :-)) SWEET

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Old 03-14-2003, 10:44 PM   #17
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What ever you do, DON'T get the head "shaved." Your saturn engine is an extremely close tolerance "interferance" engine. Move the head (valves) closer to pistons and VERY BAD things will happen. If going with a shop unfamiliar with Saturn engines, have the intake and exhaust ports matched to the manifolds and polished, SATIN intake, MIRROR exhaust. This should net some power gains without risking irreversable damage to the head by someone without the expirence to know when to STOP.

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Old 03-15-2003, 01:21 AM   #18
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and you will get the V8 sound, at least thats what this dude has around here on his coupe

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Old 03-15-2003, 03:47 PM   #19
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oh god v8 sounding saturn i4, ughhhhhhhhh *drool*. The place is a toyota dealership, so i wot ask them to shave it then. I have an extra engine so i figure i can just take the head off that. not sure what ya mean by SATIN intake and MIRROR exhaust though. has anyone here actually donr this? id like to here a testimonial

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Old 03-15-2003, 06:23 PM   #20
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A valve job alone will net you little to no additional power. A good porting job could net up to 20%.

I know some people have bored the cylinders to 2.0L. I wonder if anybody knows how much power the 2.0 Saturn will put out?

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