15.764 ET @ 86.464184078518 MPH
DD
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| MP268 cam - RPM range? https://slantsix.org/forum/viewtopic.php?t=38108 |
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| Author: | lgu32 [ Fri Nov 27, 2009 7:24 am ] |
| Post subject: | MP268 cam - RPM range? |
What is the typical RPM power range of 225 slant six with MP268 cam? Concept: 10:1 compression, oversize valves, light porting, Dutra Duals. If the max power is less than 5kRPM I will choose small BBD from 318. If the cam put my slant fly over 5kRPM, I rather choose a big 2bbl from big block. |
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| Author: | sandy in BC [ Fri Nov 27, 2009 8:37 am ] |
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Ill bet you will be happier with the smaller BBD. The 318 BBD in my similar build runs out of steam about 5000 The mid range torque is where a super 6 shines. You will want to recurve your dist..... Your idle will be better with the smaller carb. |
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| Author: | Dart270 [ Mon Nov 30, 2009 5:56 am ] |
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You can make that cam rev to 5500 or a bit more, if you have a big enough carb. I consider that a fairly docile cam for a Slant, and it's a very good street cam. BBD will probably run out around 5000, as Sandy says. Lou |
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| Author: | lgu32 [ Mon Nov 30, 2009 12:25 pm ] |
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Ok, thanks for advise. I will start with a small BBD which I already have and rebuilt it. Depending of the feelings after break in, I maybe test a bigger carb or not. The car is 1966 Dart and it has 1:3.55 gears and a TF904. A 225 with 1:8.4 compression and MP244 cam (small BBD, big valves, Dutra Duals) I have got 16.48s 1/4 mile. Now it has 1:10 compression and a MP268 cam. How much will be the improvement? (I cant test it before next summer). |
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| Author: | madmax/6 [ Mon Nov 30, 2009 1:19 pm ] |
| Post subject: | |
15.764 |
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| Author: | sandy in BC [ Mon Nov 30, 2009 1:50 pm ] |
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That seems reasonable.....but could you be more precise? |
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| Author: | madmax/6 [ Mon Nov 30, 2009 5:03 pm ] |
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Precisely a guess,Thats all you can do without a bunch more info.Even then you might not get a closer guess.Mark |
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| Author: | Doc [ Mon Nov 30, 2009 5:07 pm ] |
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15.764 ET @ 86.464184078518 MPH DD |
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| Author: | lgu32 [ Mon Nov 30, 2009 11:05 pm ] |
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Finally I have get the discussion opened  . NEXT QUESTION :Any Idea how much I will loose of the 15.764 ET with a big BBD and the flat spot in the start ?In reality: With MP244 cam there was nothing above 4500rpm and the peak power was somewhere 4000 (ass dynoed together with the G-tech accelerometer to 16.5s / calibrated that measurement to well known new cars in the same performance level at the city traffic lights). As the 318BBD is worth of 4800 rpm with 80% VE in 225 slant and if I can raise shifts from 4000 to 5000, the difference from 16.5 to 15.8 would be reality. In the "Slant Sickness" article few years ago the peak power was much below 5000 rpm even with more radical cam and with the HyperPak. I will be happy if a combo of MP268/SuperSix with 318BBD goes to same. More bang for the bug. |
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| Author: | madmax/6 [ Tue Dec 01, 2009 8:38 am ] |
| Post subject: | |
.001 to 1.00.Wilfred |
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