Max RPM on straight

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MCRacer
Posts: 75
Joined: June 28th, 2006, 12:14 am

Max RPM on straight

Post by MCRacer »

What's the max that folks see on a long straight (e.g. Roebling Road)? My Predator (long box - no draft) stopped at 5000. I seem to recall hitting 5500 at Nashville once but only got to 5000 last year.

Thanks,

Mike
smsazzy
Posts: 703
Joined: June 24th, 2006, 5:56 pm

Re: Max RPM on straight

Post by smsazzy »

I saw 6700 in the draft at California. 6400 without the draft.
Stephen Saslow
FV 09 NWR
MCRacer
Posts: 75
Joined: June 28th, 2006, 12:14 am

Re: Max RPM on straight

Post by MCRacer »

I was afraid of that. :cry:
Now where did I put that engine crate?
fv195
Posts: 119
Joined: June 24th, 2006, 1:00 pm

Re: Max RPM on straight

Post by fv195 »

I saw 6500 at roebling road drafting a SRF running a short box. you will go as fast as your car will go there. it is a good time
I was pulling 6300 no draft, and big thanks to Dave Carr at Autowerks for the motor. Roebling is a fast track.
Last edited by fv195 on March 7th, 2008, 11:42 am, edited 1 time in total.
smsazzy
Posts: 703
Joined: June 24th, 2006, 5:56 pm

Re: Max RPM on straight

Post by smsazzy »

FYI - That was with a short box.

Also, (Quick plug for the engine builder) it was an engine built by SR Racing.
Stephen Saslow
FV 09 NWR
MCRacer
Posts: 75
Joined: June 28th, 2006, 12:14 am

Re: Max RPM on straight

Post by MCRacer »

Mine is SR built also but with a dozen or so TIme Trial events on it. I've rechecked timing, dwell, and valves so I don't think that's it and it'll pull to over 6500 in lower gears. Next plan is to check fuel and air filters and ???

Thanks, Mike
SR Racing
Posts: 1205
Joined: June 24th, 2006, 1:58 pm

Re: Max RPM on straight

Post by SR Racing »

MCRacer wrote:Mine is SR built also but with a dozen or so TIme Trial events on it. I've rechecked timing, dwell, and valves so I don't think that's it and it'll pull to over 6500 in lower gears. Next plan is to check fuel and air filters and ???

Thanks, Mike
Mike, your profile isn't filled out, so I don't know who you are. Send me your name. I want to look at the dyno sheet on your engine and see what it looked like after the last rebuild.

Jim
Veefan
Posts: 247
Joined: August 14th, 2007, 9:22 pm

Re: Max RPM on straight

Post by Veefan »

Since you say the motor pulls to 6500 rpm in the lower gears, and you say you can't get over 5000 in the higher gears... it might be in your gears/transaxle. You might also want to consider checking your wheel bearings.
jpetillo
Posts: 759
Joined: August 26th, 2006, 2:54 pm

Re: Max RPM on straight

Post by jpetillo »

You also want to check your tach, Some are really far off. Mine's 300-400 RPM off at 6000. It may not answer why you're 1500 RPM shy in top gear, but it may be reading too low all the time and you may be beating up your engine by spinning it too fast in the lower gears.
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