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 8604 Posts Member #: 573 Formerly Axel Podland |
9th Dec, 2007 at 12:21:39pm
I've measured and plotted the profile of my K100 inlet cam.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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 6752 Posts Member #: 828 Post Whore uranus |
9th Dec, 2007 at 02:56:24pm
so hopefully the 250 odd cam is around 210 degrees at 50 and would be very nice at that ! Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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8604 Posts Member #: 573 Formerly Axel Podland |
9th Dec, 2007 at 03:02:35pm
Yes, pity you cannot get 250 odd duration 8v cams.
Edited by Paul S on 9th Dec, 2007. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
9th Dec, 2007 at 03:56:30pm
well,
On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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6752 Posts Member #: 828 Post Whore uranus |
9th Dec, 2007 at 04:55:52pm
On 9th of Dec, 2007 at 03:02pm Paul S said:
Yes, pity you cannot get 250 odd duration 8v cams. I can get my re-profiled. But, considering I'm trying to build an all square bottom end that will rev to 8500rpm, do I need to use the lower duration? If I time the cams at 30/74 on an LCA of 112 degrees, then there is less than 2mm lift at TDC. Overlap at 0.050" would be about 18 degrees. ahh i didnt realize that paul ,bummer , well i think your concept is the cheapest and will work , but the bottom end will be pretty floppy even with the wider lca , your looking at a 230 to 240 inlet at 50 thou and thats what... 286 to 296 timing on a normal a series cams , think of how a 998 would run on a 296 cam.. prettty peaky .your lca will flatten the curve and so on ,but high rpm should be a fair bit higher than the 8500 id have thought ,in fact it should really be the same as a turbo bmw bike would be .although i realize i have no idea where they peak !lol wack em in and see ,as 13 says not that hard to change them if it all rushes in at 4500! pop them in about 4 degrees advanced as well if i was you . Edited by robert on 9th Dec, 2007. Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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 25 Posts Member #: 2002 Member The Netherlands |
10th Dec, 2007 at 03:10:48pm
Thanks!
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8604 Posts Member #: 573 Formerly Axel Podland |
10th Dec, 2007 at 03:36:11pm
The SC build guide states that the cams should be timed at 3.4mm lift at TDC.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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 8297 Posts Member #: 408 Turbo Love Palace Fool Aylesbury |
10th Dec, 2007 at 04:28:55pm
Ive been wondering about this when timing mine in. Edited by matty on 10th Dec, 2007. https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel
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8604 Posts Member #: 573 Formerly Axel Podland |
10th Dec, 2007 at 04:58:07pm
On 10th of Dec, 2007 at 04:28pm matty said:
Ive been wondering about this when timing mine in. 
Should they be timed different for a turbo? Im sure Robert mentioned 110 degrees, does that sound about right? Im using the LT cams 256 degree. Don't mean to thread jack...  I think 110 to 112 would be good for a turbo. It will minimise the overlap and open the exhaust early which is recognised to be beneficial. With your cam, I would establish exactly where full lift is, then measure the lift at 110/112 degrees back from that. Then you know what lift to set it at with the engine at TDC. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
10th Dec, 2007 at 05:51:15pm
I thnk paul is in the rght ball park with 110-112.
On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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6752 Posts Member #: 828 Post Whore uranus |
10th Dec, 2007 at 05:55:34pm
On 10th of Dec, 2007 at 03:36pm Paul S said:
The SC build guide states that the cams should be timed at 3.4mm lift at TDC. However, from my figures, that would mean an LCA less than 100 degrees. at what tappet clearance paul ? matt you can run the gamut of lca's ,with 110 your in a good compromice situation ,and can then experiment from there .as you experiment with boost and ex back pressure etc ,the lca can need changing a lot . as i keep saying lol all engines respond differently to things ,and until its going you sometimes cant tell the best exact design ,and where you want to gain power and are prepared to sacrafice it can change dramatically when the engine is in the car and its actually going . Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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6752 Posts Member #: 828 Post Whore uranus |
10th Dec, 2007 at 05:55:38pm
.dp! Edited by robert on 29th Jan, 2012. Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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8604 Posts Member #: 573 Formerly Axel Podland |
10th Dec, 2007 at 06:09:13pm
It's measured directly at the valve bucket, so it's 3.4mm plus clearance. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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6752 Posts Member #: 828 Post Whore uranus |
10th Dec, 2007 at 06:10:34pm
yep but whats the clearance your using and is it the same for ex and in cams ? Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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8604 Posts Member #: 573 Formerly Axel Podland |
10th Dec, 2007 at 06:37:25pm
Robert, I think that I misunderstood your question.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
10th Dec, 2007 at 06:42:50pm
did you use a flat foot against the cam or the round ball? On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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8604 Posts Member #: 573 Formerly Axel Podland |
10th Dec, 2007 at 07:10:09pm
The method I used was the equivalent of a flat foot. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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25 Posts Member #: 2002 Member The Netherlands |
10th Dec, 2007 at 08:21:35pm
So with a LCA of 106 degrees you will need to time them to 2,7mm?
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6752 Posts Member #: 828 Post Whore uranus |
10th Dec, 2007 at 10:09:19pm
On 10th of Dec, 2007 at 06:37pm Paul S said:
Robert, I think that I misunderstood your question. I measured the cam profile directly off the cam. I put it in the lathe, checked it for true running, rotated it in the x-axis, measured lift in the y-axis and moved the DTI in the z-axis to ensure that I measured the lift rather than the radius. It was an inlet cam and I measured the lift ramp. The down ramp looks the same but I did not measure it in detail. whats a z axis ...time??lol what i mean paul is ,how big is the initial tappet clearance your using before you assume it will start to lift the valve ,and is it the same tappet setting for in and ex ? Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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 4559 Posts Member #: 786 Post Whore Bermingum |
10th Dec, 2007 at 10:24:08pm
Hi,
VEMs Authorised Installer / Re-seller. K head kits now available!
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8297 Posts Member #: 408 Turbo Love Palace Fool Aylesbury |
10th Dec, 2007 at 10:38:34pm
Robert mine are Ex. 0.25mm, In 0.20mm in new money. https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel
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6752 Posts Member #: 828 Post Whore uranus |
11th Dec, 2007 at 02:29:15pm
ah thanks matty Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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8604 Posts Member #: 573 Formerly Axel Podland |
11th Dec, 2007 at 05:47:34pm
On 10th of Dec, 2007 at 10:09pm robert said:
what i mean paul is ,how big is the initial tappet clearance your using before you assume it will start to lift the valve ,and is it the same tappet setting for in and ex ? I'm not assuming anything, the attached plot is the cam profile. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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4018 Posts Member #: 1757 Back to Fucking Tool status Swindon |
28th Jan, 2012 at 09:51:18pm
Any more info on this?
Drives
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