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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Sun Jun 27, 2004 3:49 pm |
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set it to TDC.
And set the value for lift on overlap. |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Sun Jun 27, 2004 5:37 pm |
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but the figure they provide comes from their research as to wot (I mean what really) gives best performance. if u've had cams re-profiled 2 ur own spec its a case of DIY. |
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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Sun Jun 27, 2004 8:33 pm |
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If you have your cam profile ground for yourself, then you will have max lift at 'x' degrees, so for this reason, at TDC there will also be an 'x' value for lift.
The cam grinder should be able to tell you what that is from his software, or indeed the software you use to design the profile.
And the cam manufacturer has their lift@TDC value which is also relative to their max lift@ 'x' degrees timing. So from this you cna set it up and advance or retard your cams as you see fit for your application.
I run my timings failry different to the reccomended, especially the kent timings. But with lft @ TDC we are talking steps of 0.01-0.1mm. |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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Mon Jun 28, 2004 12:01 am |
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so have u got a timing figure you like to use best at TDC for williams regrinds? rn2002e |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Mon Jun 28, 2004 1:38 am |
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how will the grinder know the lift @TDC figure, if they havnt experienced a certain cam/s? besides, how does the figure given by kent/piper/etc relate to the powerband i.e. is it for max peak power, best "overall" delivery, best mid-range torque.....get wot (I mean what really) im sayin?! different levels of overlap give different power-bands....
so - wot (I mean what really) im trying to get at is u either use one or the other of these lift values at a set crank angle i.e. either TDC or Xdeg ATDC. if ur not given either, it seems logical to set inlet @ around 100deg ATDC, and work from there. the reason i cant give a reference point for lift @TDC is cos this value relies on overlap, whereas @ around 100deg ATDC is gonna be max flow thru head |
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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Mon Jun 28, 2004 3:52 am |
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OK, i think i'm loosing you a bit.
If you've designed a cam you obviously have an inlcing of where your wanting peak lift to occur relative to crank degrees right. If you dont how the hell did you design the cam without considering it.
Second, can you really be arsed to design a cam then make about 20 power pulls just to test the different timing positions....no.
SO, if you designed a cam, especially on computer like the grinder will have to convert to or you would supply him with, you simply have to rock the virtual engine to TDC and check your lift on overlap.
From that point you can advance or retard....no shit that different overlap values give diffenrent engine traits......so i dont really get what your saying no. lol |
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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Mon Jun 28, 2004 3:52 am |
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| Jonnyboy wrote: |
| so have u got a timing figure you like to use best at TDC for williams regrinds? rn2002e |
yup |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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Mon Jun 28, 2004 3:55 am |
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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Mon Jun 28, 2004 4:36 am |
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Dunno.........would it be any use to u? |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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Mon Jun 28, 2004 9:52 am |
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would it matter if i didnt have a use for it but just wanted to know out of interest? |
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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Mon Jun 28, 2004 10:09 am |
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Depends how i feel on handing out free info we spent time on.
lol |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Mon Jun 28, 2004 11:00 am |
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exactly, thats how I feel Ben.
btw Ben and I are sometimes tight about the knowledge we share so you mere mortals have no chance! lol |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Mon Jun 28, 2004 11:03 am |
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lol!! i know wot (I mean what really) i mean.....! |
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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Mon Jun 28, 2004 11:03 am |
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Damn striaght.......its like sharing the most beautiful woman in the world......not a chance. |
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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Mon Jun 28, 2004 11:05 am |
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| stan wrote: |
| lol!! i know wot (I mean what really) i mean.....! |
Nxt time inform us aswell....lol |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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Mon Jun 28, 2004 11:31 am |
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ok so how much do u charge for the figure? |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Mon Jun 28, 2004 11:34 am |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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Mon Jun 28, 2004 11:40 am |
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BenR
Level 5 User
Joined: 18 Jun 2004
Posts: 114
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Mon Jun 28, 2004 11:46 am |
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i charge about 300 quid, but with the timing figures comes a free set of cams, labour for the install and setup!
Bargain! |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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Mon Jun 28, 2004 11:50 am |
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so what if u already got the cams, installed and just need a figure? |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Mon Jun 28, 2004 12:04 pm |
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JB please note new sticky at the top of this forum.
If ben is willing to give out info he will, if you want the info private message him, if he asks that you go along to him and he times them and whatever else hes does then fine.
he may be small but he still needs to eat and him giving you info hes worked hard on obtaining for nothign doesn't put bread ont he table. |
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