Key factors to rediculously high rpms? Just a discussion out of interest.

bajachris88 · 2010-06-13T05:55:37+00:00

this is just a subject out of interest. I was watching some videos, firstly a f1 cosworth v8 doing 20,000 rpm, followed by something a little more educational, some japanese show translated of the spoon engineers raising the red line of an inline 4 from like 7000rpm to 10000rpm. was a very eductional video, excuse the rice, but if ur a motor enthusiast, its worth the watch (translated) They proved its worth on the track with the same head geometry as the original engine in that it allowed a better shift rpm to maintain optimal rev position in the power band. (they race stock vs. high rpm) Amongst perfect balancing and vibration reduction, as displayed in the last video, and taking into account conrod's and fasteners, valve behaviour, what over major keys are there to gain 'reliable' high rpm ranges to take advantage of high horsepowers from lumpy cams and head tuning? From vague memory, i think i can recall some people mentioning 7000rpm red lines alone on their type 1 vw engines, (or course veyr much worked lol). I wonder what it would sound like at 9000rpm lol, If the headwork and cams proved to have any reason to go up to this rev range at all... 🙂 Chris.

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 · 24 Jun 2010, 9:05 am

#786621

yes they are the head I been looking for such a long time. web page doesn't seem to work properly? can hardly see anything!

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

zayus Wolfsburg Wizard

437 posts · joined Sep 2002 · 24 Jun 2010, 1:44 pm

#786654

I just updated the link - http://www.jpmotorsport.se/

This link will display the whole page.Then select the English icon at the bottom right of the homepage.

You have to love, how JPM states: their heads are designed "primarily for street use"... the intake valve is only 48mm!

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 · 24 Jun 2010, 3:33 pm

#786673

I was like 48mm! sound bit much for my wishlist street single turbo efi 2180

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

vassy66T1 Wow ... are U reading this?

2,120 posts · joined Jun 2003 · 24 Jun 2010, 4:00 pm

#786678

Motor sounds great, but I love how a piece falls off the monster tacho at the end. 😉

Damn you Murphy

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 · 24 Jun 2010, 6:02 pm

#786703

big bore + small stroke + long rods= serious rpm

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE