Trev Posted October 2, 2006 Report Share Posted October 2, 2006 Hey guys I'm just curious as i seen in a recent post that they revved their 3k to 9000rpm i would just like to know how many of you have actually done this as it is a pushrod ohv setup, Thanks Quote Link to comment Share on other sites More sharing options...
Corolla_Kid Posted October 2, 2006 Report Share Posted October 2, 2006 I've got a 5k getting built at the moment which is having a full balanced, blue-printed bottom end with a big cam which were expecting to rev to 9000. I've hit almost 8000 with a pretty mild 5k so yeah i don't see 9000 being an outrageous value. :jamie: Quote Link to comment Share on other sites More sharing options...
Medicine_Man Posted October 2, 2006 Report Share Posted October 2, 2006 Sure you can get them to rev that hard, But they won't last terribly long if you keep it there all day.. Quote Link to comment Share on other sites More sharing options...
Xany Posted October 2, 2006 Report Share Posted October 2, 2006 Keep in mind that revving to 9000rpm on a daily basis will do some kind of damage fairly quickly.....these engines arent unbreakable. Quote Link to comment Share on other sites More sharing options...
Trev Posted October 2, 2006 Author Report Share Posted October 2, 2006 I only ask cause i know that 9000rpm is fairly high for a 4AGE and i have only taken mine to around 7k, id be worried about bending a push rod and so on in a 3k. Quote Link to comment Share on other sites More sharing options...
coln72 Posted October 2, 2006 Report Share Posted October 2, 2006 would clock the tacho with my 5K. Thats 8000rpm with a standard bottom end Quote Link to comment Share on other sites More sharing options...
Des Posted October 2, 2006 Report Share Posted October 2, 2006 The tacho in my 4k reckons its been to 9750 but i don't know how accurate it is when bodgerly hooked up. Quote Link to comment Share on other sites More sharing options...
camerondownunder88 Posted October 3, 2006 Report Share Posted October 3, 2006 Hi, don't know how hard my 3K has rev trev as I have no tacho. But too quick you said ur tacho is done bodgerly if it is on the coil and held firm with no other wires crossed can't see why even if it looked messy isnt readign the right RPM unless gauge is out or shit it's self..lol Cameron Quote Link to comment Share on other sites More sharing options...
towe001 Posted October 3, 2006 Report Share Posted October 3, 2006 You wouldn't want to have a loose tappet at those revs thats for sure Quote Link to comment Share on other sites More sharing options...
Des Posted October 3, 2006 Report Share Posted October 3, 2006 Hi, don't know how hard my 3K has rev trev as I have no tacho. But too quick you said ur tacho is done bodgerly if it is on the coil and held firm with no other wires crossed can't see why even if it looked messy isnt readign the right RPM unless gauge is out or shit it's self..lol Cameron I don't know what the ppm is of a 4k so i just set it to 1.5 i think and it worked ok. Quote Link to comment Share on other sites More sharing options...
Trev Posted October 3, 2006 Author Report Share Posted October 3, 2006 Hi, don't know how hard my 3K has rev trev as I have no tacho. But too quick you said ur tacho is done bodgerly if it is on the coil and held firm with no other wires crossed can't see why even if it looked messy isnt readign the right RPM unless gauge is out or shit it's self..lol Cameron Set your tacho to 6 or 8 when on a 4 cylinder and it will read alot more revs. Quote Link to comment Share on other sites More sharing options...
love ke70 Posted October 13, 2006 Report Share Posted October 13, 2006 umm, it will read less 4 sparks per rpm if set to an 8 cyl motor its expecting 8 sparks per rpm so your poopy k motor is doing 6000 rpm. this equals 400 sparks per second a v8 at 6000 rpm would produce 800 sparks per second therefore the tacho if hooked to poopy K motor but set to 8cyl will read 3000 rpm when real engine speed is 6000. Quote Link to comment Share on other sites More sharing options...
Redwarf Posted October 13, 2006 Report Share Posted October 13, 2006 (edited) Been there done that. My 3K had a 7K change mark, but would go out to 9K, but not something I did everyday, funnily enough. Wouldn't go any harder than that as the valve springs wouldn't let it. Readings as per an Autometer Tacho. Pulled 8K cheerfully on the dyno. A 4AG should be able to crap 7K in all day everyday. 9K I believe on a decent one is a very realistic achievement. Build them right and they don't break. Edited October 13, 2006 by Redwarf Quote Link to comment Share on other sites More sharing options...
kangaroosa Posted October 13, 2006 Report Share Posted October 13, 2006 (edited) I have had a throttle linkage jam whilst my foot was meshed against the floor. As I switched the engine off, I saw the tacho falling from 12,000RPM. The only damage was 3 snapped valve springs. Actually it was only the inner springs, as they were aftermarket dual valve springs. That was in my 5K. My 5K now happily goes to 8000RPM. My first engine was a standard 3K. Not a day went past where that motor didnt see 7000+RPM with a 32/36 weber. It was still fine when i pulled it out after many years of abuse. Never burnt any oil either. Edited October 13, 2006 by kangaroosa Quote Link to comment Share on other sites More sharing options...
Redwarf Posted October 13, 2006 Report Share Posted October 13, 2006 The moral of the story is that K motors don't tend to bend pushrods. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.