timing gears
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plost
- Posts: 12
- Joined: Mon Nov 28, 2005 9:53 pm
timing gears
Thinking about timing gears for my 1.7 litre. It has been beefed up a bit already. Love the sound, any problems i should know about?
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Twystd1
- Posts: 323
- Joined: Sat Nov 13, 2004 8:42 pm
Straight cuts are sometimes very loud.
Depends on the alloys, the angle/radius of each tooth and if the gears are coated and lastly if someone took the time to file away ALL the imperfections if any....
Personally.. SCAT SUCKS.... Annendorp is good. At least the ONE that I installed was... Had gears coated (both gears) and spend hours with some 400 grit emery paper... before I sent them out for coating.
By the way.... Why do you think you may need a straight cut setup????????
Twystd1
Depends on the alloys, the angle/radius of each tooth and if the gears are coated and lastly if someone took the time to file away ALL the imperfections if any....
Personally.. SCAT SUCKS.... Annendorp is good. At least the ONE that I installed was... Had gears coated (both gears) and spend hours with some 400 grit emery paper... before I sent them out for coating.
By the way.... Why do you think you may need a straight cut setup????????
Twystd1
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Type 4 Unleashed
- Moderator
- Posts: 2202
- Joined: Tue Nov 08, 2005 10:43 pm
STRAIT CUTS
Hi plost, I've been running strait cuts for some time now, I run them cause I run quite alot of spring pressure.
Stock gears with lots of spring presure, will wear the cam thrust bearing faster, which increases end play, and as the thrust wears, the cam lobes lose alignment wiith the lifters.
I, thought I could deal with the whinning, well I have and for too long, cause it's driving me up the FN wall.
Mine, I laped, but I didn't have them coated, then I don't think coating them would of quited them, that much. Another thing about strait cuts, like after market alum cam gears they are made to fit alot of cases, and their made in a -3, and what that is the size of the cam gear, to fit a particular case, when the line bore was originaly done, each case is different, due to set up and core shift, and the difference between the crank bore & the cam bore was not exact, the diistance's were made up in the cam gears sizes, examples: 0, +1, +2, +3, & -1, -2, -3, where the cam bore was closer to the crank a smaller dia. came gear was needed, hence the minus sizes, and when the cam bore was farther away from the crank bore + sizes were used.
In, my motor, I've used a after market aluminum -3 gear, and a stait cut -3, and the strait cut, had considerably more gear lash than the supposedly same size aluminum -3. There is some of the whine issue.
You'll, not run the kind of spring pressures I do, so you don't need them, and may be they sound cool in some one elses car, drive with them for over a year
the coolness will wear off 
.
I'am pulling my motor, to due a new modified rod swap, and pistons and cylinders and I am pulling the strait cuts. I want some peace and quit for a while
.
Stock gears with lots of spring presure, will wear the cam thrust bearing faster, which increases end play, and as the thrust wears, the cam lobes lose alignment wiith the lifters.
I, thought I could deal with the whinning, well I have and for too long, cause it's driving me up the FN wall.
Mine, I laped, but I didn't have them coated, then I don't think coating them would of quited them, that much. Another thing about strait cuts, like after market alum cam gears they are made to fit alot of cases, and their made in a -3, and what that is the size of the cam gear, to fit a particular case, when the line bore was originaly done, each case is different, due to set up and core shift, and the difference between the crank bore & the cam bore was not exact, the diistance's were made up in the cam gears sizes, examples: 0, +1, +2, +3, & -1, -2, -3, where the cam bore was closer to the crank a smaller dia. came gear was needed, hence the minus sizes, and when the cam bore was farther away from the crank bore + sizes were used.
In, my motor, I've used a after market aluminum -3 gear, and a stait cut -3, and the strait cut, had considerably more gear lash than the supposedly same size aluminum -3. There is some of the whine issue.
You'll, not run the kind of spring pressures I do, so you don't need them, and may be they sound cool in some one elses car, drive with them for over a year
the coolness will wear off .I'am pulling my motor, to due a new modified rod swap, and pistons and cylinders and I am pulling the strait cuts. I want some peace and quit for a while
.
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plost
- Posts: 12
- Joined: Mon Nov 28, 2005 9:53 pm
straight cut.
I only put on 300-400 miles per year. When i bought the car the guy said it was 150 to 160 horse power (never tested). It is definately more than 80 HP. It's very quick. I love the sound straight cut gears make and I don't drive the car that much, I don't need the gears in though. I thought I could probably live with the wine no matter how loud. The truth is I didn't realize you had to crack the case to put them in, so I probably won't. Just out of curiosity one gear bolts on and the other is pressed on right?