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SWEET
Fully Licenced
600 Posts
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 Posted - 26 Jan 2007 : 6:12:10 PM
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hi this mite sound dumb but like i said in my vn talk forum im here to learn so heres my first question wats roller rockers and wat do they do and wats those number ratio thing do and how do u tell from those numbers 1 thing i do know is that its coming from somwhere under the rocker cover which is that red tangle thing. thanx again ppls i should change my name to CLUELESS hehe!
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mouce
National Driver
1525 Posts
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Posted - 27 Jan 2007 : 11:50:27 AM
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Okay, first up...red tangle thing? Huh?
Anyway...open your bonnet and start looking at the engine  You know the oil filler hole? That's one of the rocker covers, over the other side of the engine, you'll see another beige cover, just without the oil filler hole in it. That's the other rocker cover.
Before covering what roller rockers are, let's explain rockers. The rockers do exactly what their name suggests, they rock. (sorry couldn't resist that). Seriously...the rockers act as a lever, pushed by the pushrods, these pivot around the mid point, and then the other end of the 'lever' pushes against another set of rods which open the valves (thus letting the air/fuel into the cylinder and the exahust gasses out).
Now...normally these just slide across the top of the rods, which creates a certain amount of friction. The more friction inside an engine, the more power it takes to make the motor turn, which means the less power that makes it to the road. Roller rockers, instead of sliding across the top of the rods, have little wheels in them that 'roll' across the top of the rods, this has much less friction that just 'sliding' across the top of them. This makes the engine a little more efficient.
The ratio that everyone is talking about is how much the 'valve' end of the lever moves. For example a 1:1 ratio rocker might lift 1cm at the pushrod end, and would open the valve 1cm at the other end of it. The pivot point would be in the middle.
A higher ratio say a 1.6:1 means that if the cam moves the pushrod end of the rocker 1cm, then the valve will open 1.6cm. The wider you open the valve the more efficiently you can let the air/fuel in and the exhaust out.
BUT...and here's the catching point...to get the most out of a set of higher ratio rockers (roller or standard) you need to have a good exhaust setup, a good air intake system AND look at getting your engine map changed to really get them to do their best work.
Hope it helps.
BTW: there's no stupid questions, only stupid answers. Never be afraid to ask questions. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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SWEET
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Posted - 27 Jan 2007 : 1:09:11 PM
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| Hi mouce nice to meet u and thanx alot for the answer and a very clear one indeed now i know exactly watcha talking bout well kinda but i do get it now much betta thanx again. how much do they cost r they expensive? and wats the highest ratio u can get. also wat happened to my burn out question did u delete it mouce lol naughty naughty man lol kidding ok thanx again and ill b posting more questions keeping u guys busy with ur fingers errr hand lol k.thanx again b4dn! xxxx |
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mouce
National Driver
1525 Posts
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Posted - 27 Jan 2007 : 10:31:12 PM
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A good set of yella terra 1.9:1 roller rockers will set you back a little less than a grand, then you can fit it yourself if you're handy enough with the spanners.
BUT...for most ratios above 1.6 you'll need to find spacers for your rocker covers as it's almost a certainty that your nice shiny new roller rockers will smash into your rocker covers unless you raise them a bit
The burn-out thread was removed because it was asking about illegal activities. I am one of the moderators on this forum, and as such, it's my responsibility to make sure that the forum is kept in good order. Threads asking about illegal modifications will be locked, illegal driving practices will be removed, and any abusive or derogatory language will be censored.
Ultimately this is setup to be a family friendly forum where we encourage people to look after their cars. Anything that is deemed not family friendly will be removed. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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SWEET
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600 Posts
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Posted - 28 Jan 2007 : 04:21:23 AM
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k understandable now mouce. and dam those rockers are high priced. but thanx again mouce seems like your the only one here im seeing reply to posts most the time. who is this mysterious person? hmmmmm... lol if i buy them will they come in silver :)
k thanx again b4dn xxxx |
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mouce
National Driver
1525 Posts
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Posted - 29 Jan 2007 : 12:16:22 AM
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Those rockers are priced fairly well when you look at what you're getting out of it. It has a similar effect to having a slightly higher cam put in, with only a fraction of the labour costs.
From memory the yella terra ones come in your choice of yellow or yellow. Not that it really matters, you can't see the damn things.
As for me replying to so many posts, I have spent a long time getting to know my VN, no reason I can't share that information with other people. If it saves them money or time, it's even better. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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SWEET
Fully Licenced
600 Posts
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Posted - 29 Jan 2007 : 03:02:33 AM
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| lol,lmao o...k so they come in yellow and yellow. huh wats the dam differents lol, lmao. mayb u cuold if som1 invented c through rocker covers. hey how cool would that b. anyways thanx again. oh yh how do i put pics in my profile. |
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mouce
National Driver
1525 Posts
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Posted - 29 Jan 2007 : 10:14:14 AM
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| See through rocker covers would be fairly pointless given the amount of oil that goes sloshing around up there ;) |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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trizo
Forum Moderator
3091 Posts
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Posted - 29 Jan 2007 : 10:43:09 AM
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| okok heres 1 what are rokn rollers then????? |
3 can keep a secret if 2 are dead |
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SWEET
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600 Posts
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Posted - 29 Jan 2007 : 11:45:57 AM
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| lol mouce true sloshing oil hmmmmmm... and for trizo HUH! lol |
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mouce
National Driver
1525 Posts
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Posted - 29 Jan 2007 : 12:05:05 PM
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| rokn rollers? I guess that's what you get when you put roller rockers in your car backwards LOL!!! |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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trizo
Forum Moderator
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Posted - 29 Jan 2007 : 12:44:17 PM
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| I knew u would work it out...... lmao bakwards !!!!! |
3 can keep a secret if 2 are dead |
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SWEET
Fully Licenced
600 Posts
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Posted - 29 Jan 2007 : 10:29:06 PM
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| hmmm bakwards? cant seem to imagaine it cos havnt seen roller rockers on the move but anyways funny atleast this forum had abit of life in it. TOP SITE! b4dn xxxx |
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