Straight up and dot to dot the same?
TECH Enthusiast
Joined: Nov 2001
Posts: 712
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From: Dallas,Texas
Re: Straight up and dot to dot the same? make it look like this
http://www.ls1info.com/article.php?sid=192
dot-2-dot ( straight up sound right also )
http://www.ls1info.com/article.php?sid=192
dot-2-dot ( straight up sound right also )
TECH Fanatic
Joined: Aug 2002
Posts: 1,566
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From: Objects in mirror no longer matter.
Re: Straight up and dot to dot the same? Straight up refers to a cam with zero advance. This is confusing because you can install a cam "dot to dot", but the cam can be advanced depending if any is grinded into the cam.
Thread Starter
Joined: Nov 2001
Posts: 8,259
Likes: 4
From: Valrico, Florida
Re: Straight up and dot to dot the same? If the cam has +4 grind into it and you install it.. Is straight up and dot to dot the same..? Will is still have the +4?
Thread Starter
Joined: Nov 2001
Posts: 8,259
Likes: 4
From: Valrico, Florida
Re: Straight up and dot to dot the same? Thanks Chris.. Thats the answer I was looking for. I could have swore I read a post that stated they were the same when the cam has advance ground in.. Someone was trying to tell me that my cam had to be installed other than dot 2 dot secondary to where my car is peaking..
<small>[ August 09, 2002, 09:54 AM: Message edited by: VINCE ]</small>
<small>[ August 09, 2002, 09:54 AM: Message edited by: VINCE ]</small>
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Re: Straight up and dot to dot the same? Straight up generally means that there is no advance. It's dot to dot. However, as stated, if there is advance ground into the cam, then you would still put it dot to dot, and it would still have the advance.
Ya, what Chris said <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Ya, what Chris said <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
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Re: Straight up and dot to dot the same? Vince,all timing chains install dot-to-dot.Stright-up just means that it is installed without altering the relationship between the camshaft and camshaft gear.NOW that dosen't mean that it is installed to the correct intake centerline.The +4 is ground in to take up for slack in timing stretch.When you degree a cam you make up for machining tolerence's for the camshaft,gears,and chain.The gear is moved on the camshaft to compensate for these differences and to installed to the desired intake centerline. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
The only timing chain that dosen't get installed dot-to-dot once degreed in is the SLP double roller chain set up.
The only timing chain that dosen't get installed dot-to-dot once degreed in is the SLP double roller chain set up.
Staging Lane
Joined: Dec 2001
Posts: 90
Likes: 0
From: San Clemente, CA
Re: Straight up and dot to dot the same? Hi,
You install a timing chain “dot-to-dot”.
This is the as-designed condition where the timing mark on the crank gear and the timing mark on the cam gear line up with an imaginary line running through the center of the crank and cam.
You grind a cam "straight-up".
This means that the cam is ground without advance or retard in relation to the crank with the piston at TDC.
Installing a chain doesn’t guarantee where the cam is in relation to the crank. You can take it on faith or degree it in. As an example, Comp’s normal inspection tags only shows you where one lobe is. Timing sets don’t come with inspection tags but I have never heard of anybody verifying a timing chain set is correct. Most of us install the chain “dot-to-dot” and expect the cam to be phased as advertised. To know it’s right, you can Cam Doctor the cam and then degree in the number one cylinder to verify the timing set. Comp will Cam Doctor your cam for a fee before it ships.
Good luck,
Steve
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
You install a timing chain “dot-to-dot”.
This is the as-designed condition where the timing mark on the crank gear and the timing mark on the cam gear line up with an imaginary line running through the center of the crank and cam.
You grind a cam "straight-up".
This means that the cam is ground without advance or retard in relation to the crank with the piston at TDC.
Installing a chain doesn’t guarantee where the cam is in relation to the crank. You can take it on faith or degree it in. As an example, Comp’s normal inspection tags only shows you where one lobe is. Timing sets don’t come with inspection tags but I have never heard of anybody verifying a timing chain set is correct. Most of us install the chain “dot-to-dot” and expect the cam to be phased as advertised. To know it’s right, you can Cam Doctor the cam and then degree in the number one cylinder to verify the timing set. Comp will Cam Doctor your cam for a fee before it ships.
Good luck,
Steve
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
