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ap_sand Samba Member
Joined: November 07, 2008 Posts: 249 Location: Woodinville, WA
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Posted: Mon Jun 11, 2012 5:39 pm Post subject: Compression recommendation please |
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I have a FK-41 cam but no card. I don't know the intake close to plug into the calculators
1600 cc
54 cc chambers
1.4 rockers
1 3/8" extractor
Dual 40 Dellortos w/28mm vents
Only running it up 4000-4200 rpm.
Ready to use premium fuel.
Thanks,
Andrew |
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vwracerdave Samba Member
Joined: November 11, 2004 Posts: 15280 Location: Deep in the 405
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Posted: Mon Jun 11, 2012 5:51 pm Post subject: |
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8.0-8.2 and there is absolutly no need to run premium. 87 gas is all you need with that cam. _________________ 2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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DarthWeber Samba Member
Joined: November 24, 2007 Posts: 7543 Location: Whittier,CA
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Posted: Mon Jun 11, 2012 6:06 pm Post subject: |
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8:1 will give you about 6.5:1 dynamic, as Dave said, just fine for 87 octane. _________________
Mitey62 wrote: |
Swapped the Compufire for a Bosch blue and some points I had sitting around, started 1st crank. Took her out for a drive, pulls harder, more RPM, and runs smoother. I think I'll be sticking with points from now on. |
RockCrusher wrote: |
JB weld the case halves....that'll keep the fretting to a minimum. |
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mark tucker Samba Member
Joined: April 08, 2009 Posts: 23937 Location: SHALIMAR ,FLORIDA
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Posted: Mon Jun 11, 2012 8:40 pm Post subject: |
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I would see what the cr is at about .035 piston to head clearance. |
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DarthWeber Samba Member
Joined: November 24, 2007 Posts: 7543 Location: Whittier,CA
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Posted: Mon Jun 11, 2012 9:04 pm Post subject: |
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mark tucker wrote: |
I would see what the cr is at about .035 piston to head clearance. |
That would be 7.7:1 (6.3:1 dynamic) with his 54cc chambers. Although I would never recommend any street engine be run with that little deck height. Just my opinion. _________________
Mitey62 wrote: |
Swapped the Compufire for a Bosch blue and some points I had sitting around, started 1st crank. Took her out for a drive, pulls harder, more RPM, and runs smoother. I think I'll be sticking with points from now on. |
RockCrusher wrote: |
JB weld the case halves....that'll keep the fretting to a minimum. |
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ap_sand Samba Member
Joined: November 07, 2008 Posts: 249 Location: Woodinville, WA
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Posted: Mon Jun 11, 2012 9:17 pm Post subject: |
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Great guys, just what I needed.
With 0.040 deck it calculates out 7.64 static/6.85 dynamic.
With 0.035 deck, 7.73/6.92.
I'll see how much I can tighten it up.
I appreciate it, thanks!
Andrew |
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ap_sand Samba Member
Joined: November 07, 2008 Posts: 249 Location: Woodinville, WA
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Posted: Mon Jun 11, 2012 9:23 pm Post subject: |
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Oh, one more question if you will humor me...
Single heavy duty springs ok for that low a red line?
Andrew |
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66brm Samba Member
Joined: January 25, 2010 Posts: 3676 Location: Perth Western Australia
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Posted: Mon Jun 11, 2012 9:25 pm Post subject: |
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I wouldn't the FK 40-series are known for fast ramps and with 1.4 rockers...... I don't think the singles will give enough control _________________ Aust. RHD 66 Type 1
Aust. RHD 57 Type 1 Oval
modok wrote: |
I am an expert at fitting things in holes, been doing it a long time |
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midtravelmidengine Samba Member
Joined: August 06, 2009 Posts: 861 Location: Riverside, Ca
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Posted: Mon Jun 11, 2012 10:06 pm Post subject: |
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recheck your calculations it sounds like you are using the .050" numbers. your dynamic is too high. _________________
modok wrote: |
And I know you don't know because if you did you would know the reason for my knowing you didn't. |
youngnstudly wrote: |
I just wasn't sure if I should recommend the 1/3 race cam, the 1/2 race cam, or the 5/8 race cam instead...guess it depends on how much of the race he wants to lead???
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