 dual valve springs, max. RPM? |
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| SirAndy |
  Oct 4 2005, 11:22 AM
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Resident German  Group: Admin Posts: 41,688 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California  |
ok, i'd like to get an educated guess as to what my approx. max. RPM would be with a 2056 with heavy duty dual valve springs, solid rocker spacers, 911 swivels, slightly bigger valves, 9:1 compression ...
as far as i can tell, the components used are good quality. i had the rev. limiter set to 6000 rpm which seemed to be on the safe side. only hit the limiter 2 or 3 times during a AX. always ran plenty of oil, got a tuna can on the motor. no lean running ... the motor always felt like it wanted to pull past 6000 and wasn't done with it's peak power yet so i'm thinking there has to be more ... anyone who can give me a hint as to where the redline could be? ballpark? (IMG:http://www.914world.com/bbs2/html/emoticons/idea.gif) Andy |
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| Jake Raby |
Oct 4 2005, 02:44 PM
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
It is absolutely impossible to crunch the numbers relating to the point one will attain valve float without considering the weight of the reciprocating valvetrain mass!
Lightweight components need less valve spring tension.. I run dual springs anytime we are running .485 lift+ We get further and further away from heavy springs every time we build another R&D engine.... Len and I are now running 8500 RPM with our featherwight valve train and a SINGLE valve spring... granted its not an off the shelf single spring and its retainer weighs less than 5 grams! BTW- The biggest mistake made is running a dual spring or any performance spring with a stock retainer- the stock retainer absolutely sucks! I have all the trick valvetrain stuff on my site except the featherweight arrangement, those are only available on full RAT engines. |
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Posts in this topic
SirAndy dual valve springs, max. RPM? Oct 4 2005, 11:22 AM
nebreitling cam, rods, pushrods?
i've heard mixed things ... Oct 4 2005, 11:54 AM SirAndy ... Oct 4 2005, 02:16 PM URY914 What about the push rods?
Stock or CoMo? Oct 4 2005, 02:19 PM Brando One thing I've seen is bent pushrods (old stoc... Oct 4 2005, 02:30 PM URY914 Jake sells Chrome Moly push rods blanks.
You'l... Oct 4 2005, 02:33 PM Joe Ricard Dang Jake, That's about one ______ Avatar... Oct 4 2005, 03:57 PM Jake Raby .And thats not even my war face......
People have... Oct 4 2005, 05:51 PM Aaron Cox brando.. cromo pushrods Oct 4 2005, 05:55 PM cha914 My Raby 2056, was tested on the dyno up to 7300, b... Oct 4 2005, 05:58 PM Aaron Cox andy - what do you think happened? can you describ... Oct 4 2005, 06:02 PM SirAndy ... Oct 4 2005, 06:07 PM Jake Raby I bet you didn't have a CHT gauge....
BUY FRI... Oct 4 2005, 06:22 PM Aaron Cox ... Oct 4 2005, 06:24 PM Jake Raby If I were that powerful I'd blow up a certain ... Oct 4 2005, 06:29 PM Aaron Cox ... Oct 4 2005, 06:30 PM DNHunt I smell http://www.914worl... Oct 4 2005, 06:49 PM SirAndy ... Oct 4 2005, 07:48 PM
Jake Raby No, been really busy...
And the $$ I se... Oct 4 2005, 07:52 PM |
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