SPArKy_Dave 8,865 Posted September 6, 2014 Who has info on this fella. I can't find anything. I have one pic, and some sketchy info. He was a guy up in townsville that was making twin cam heads that fit on the I6 4L as well as the Crossflow 4.1L and the Holden 6's. Apparently, they tested his heads in streetmachine mag August 2000 on an XR6 ute. Those heads bolt onto any holden 186/202 or ford 200/250 or I6 ohc. Pretty trick gear. Twin belt driven cams. Twin sparkplugs per cylinder. I think the article found, it was good for around 325hp on an otherwise stock AU XR6. Apparently in the end, poor marketing and the BA DOHC is what killed these heads. They retailed for around $2.5k brand new the article said. https://www.facebook.com/Aussiespeed/videos/901370843206896 1 Outback Jack reacted to this Share this post Link to post Share on other sites
NZXD 2,328 Posted September 6, 2014 I recall something in street machine about these around that time. Share this post Link to post Share on other sites
Banno 479 Posted September 6, 2014 This what you talking about? 1 SPArKy_Dave reacted to this Share this post Link to post Share on other sites
gerg 10,871 Posted September 6, 2014 Looks like it's loosely based on a Jag 6 head, sounds the goods. I'd pay that much even now for that, sounds like a good price to me. Uncanny how Ford and Holden 6s shared bore spacing and head bolt location. I've seen a Red motor with an alloy crossy head adapted to it. 1 Searley reacted to this Share this post Link to post Share on other sites
BigCav 464 Posted September 6, 2014 remember the crossflow one getting upwards of $4000 dollars with no cams or something too, this would of been around 2002 before ba remember there was alot of talk on the forums back then but it all just disappeared Share this post Link to post Share on other sites
BigCav 464 Posted September 6, 2014 patents and drawings http://www.ipaustralia.com.au/applicant/michael-robert-krogdahl/designs/199303732/ 1 gerg reacted to this Share this post Link to post Share on other sites
SPArKy_Dave 8,865 Posted September 6, 2014 patents and drawings http://www.ipaustralia.com.au/applicant/michael-robert-krogdahl/designs/199303732/ Good find mate! Looks like he let it go out of copyright...... must not have been worth his time. It'd be really interesting to get in touch with the fella, and see if he's still got any specs, left over stock, moulds etc. I can see a heap of potential for further development. Loving the individual throttle body idea too! 1 Outback Jack reacted to this Share this post Link to post Share on other sites
Gravelrash 36 Posted September 6, 2014 i have just messaged a Bob Krogdahl, hopefully hes the one. Share this post Link to post Share on other sites
Gravelrash 36 Posted September 6, 2014 theres a few more pics of the Krogdahl heads and engine on the fb page. Fans of the Ford 6 cylinder crossflow & ohc engine Share this post Link to post Share on other sites
XFChris 126 Posted September 6, 2014 Really cool. I'd be interested to see the difference they make on a 250 and OHC ford 6. Share this post Link to post Share on other sites
BigCav 464 Posted September 7, 2014 i have just messaged a Bob Krogdahl, hopefully hes the one. his proper name is Michael Robert Krogdahl if that helps Share this post Link to post Share on other sites
SPArKy_Dave 8,865 Posted September 7, 2014 theres a few more pics of the Krogdahl heads and engine on the fb page. Fans of the Ford 6 cylinder crossflow & ohc engine Copy them, and post them up here, if you get a chance! Share this post Link to post Share on other sites
Mixalis 266 Posted September 7, 2014 Here you go, from the FB page [/url] And not 100% where this was from but ill throw it here anyway 3 Valvebouncer, Outback Jack and gerg reacted to this Share this post Link to post Share on other sites
Banno 479 Posted September 7, 2014 Sweet read! Thanks for that. Don't think the fella was ever going to make a success out of his cylinder heads. Timing was wrong by 40 years. Wonder if either Ford or GM paid for any of the research results on the heads particularly the AU xr6 ? Share this post Link to post Share on other sites
gerg 10,871 Posted September 7, 2014 I remember a Wheels article back in probably 93-ish showing sketches of the upcoming EF and some spy shots of a DOHC donk in testing. They must have realised that there was no point bringing it out when their main competition was sticking to an ancient cast iron pushrod lump and thus their SOHC design was already superior for now. Fast forward to the BA and it turns out that development on the twin cam had been going on for more than a decade. Seems like they had this design sitting on the shelf ready for when they needed it. Imagine if they'd shoved it into an E-series all those years ago... Would have been a weapon! Share this post Link to post Share on other sites
Valvebouncer 2,389 Posted September 7, 2014 That last photo says 1987 prototype and it has a broadband manifold on it. That was real eased in 1994, 7 years later! I can only imagine what they are working on in 2014 that we will see in 2021! Share this post Link to post Share on other sites
Outback Jack 6,352 Posted September 7, 2014 Mmmmmmmmm..... get in Ma Ute!!!! Jack. Share this post Link to post Share on other sites
Mixalis 266 Posted February 26, 2015 Just an update for those still interested, i hope this link works, anyway the rundown:https://www.facebook.com/video.php?v=901370843206896 From AussieSpeed:"For any one interested, 2 very rare engines will soon be for sale. These are 2 of just 14 ever built. The sale has nothing to do with us we have been asked if we can assist with making it public that the first ever DOHC Crossflow triple weber Krogdahl 250 engine is for sale It isn't cheap but is a real piece of history. The engine has been rebuilt and comes complete mounted on an engine stand and is running.""Ok Bob is Asking $65,000 for the engine, it is a lot of money and a lot of engine and it was also the first engine ever built and run.it has 3xdcoe webers , twin distributor ignition system, many internal mods to engine, revs to 10,000 rpm it has been freshly rebuilt. Who ever buys it will get the full Krogdahl storey from Bob the Genius Himself. Plus the option to buy all tooling to reproduce the heads again. You are buying more than just an engine, you are buying a piece of History.. " 2 SPArKy_Dave and Thom reacted to this Share this post Link to post Share on other sites
wazzy250 167 Posted February 26, 2015 Fook me. 65 grand. Worth it but. Share this post Link to post Share on other sites
gerg 10,871 Posted February 26, 2015 Revs to 10 grand... Pfffft only if it's 1.5 litres and built by Yamaha. Who would pay 65 Gs for an extremely rare engine then try and rev it to 10 grand anyway? 1 1 Searley and matt_lamb_160 reacted to this Share this post Link to post Share on other sites
Nath 1,975 Posted February 26, 2015 Someone with enough money to buy the remaining 13 if it explodes? 1 Searley reacted to this Share this post Link to post Share on other sites
Outback Jack 6,352 Posted February 26, 2015 Not a bad price for all the casts etc, could make ya own twin cam heads with no design work. Jack. Share this post Link to post Share on other sites
Mixalis 266 Posted February 27, 2015 I think that the 65 is just for the engine tho with the casts and tooling extra from what I understood?? To be honest I was hoping aussiespeed was going to get the designs etc to start remanufacturing. Would be very expensive as expected but would be great bolt on with all the equipment already in there Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
gerg 10,871 Posted February 27, 2015 With the price that Aussiespeed like to charge for everything, you'd think they could afford it all 1 1 Searley and Outback Jack reacted to this Share this post Link to post Share on other sites
