ando76 4,354 Posted October 9, 2017 There are several designs in the exhaust thread mate. Have a look. Some of them have even resulted in reduced et's Share this post Link to post Share on other sites
broken-wheel 659 Posted October 9, 2017 yup 3" off the shelf HM55, cut it right after the last weld and weld in a cone to 3", 850cm from the cone bolt a 3" hooker and a tail pipe job done, anything more will cost a truckload of money for very little more power make sure they don't weld the tail pipe to the muffler and that they keep the muffler located if you decide to unbolt the tail pipe so you can easily unbolt it and bold in a short 30degree elbow if the track allows you, the sound alone is worth it 1 Outback Jack reacted to this Share this post Link to post Share on other sites
XPT 673 Posted October 9, 2017 1 hour ago, broken-wheel said: Same same! Here is mine, pulled it out of storage after about 13 months ... first start don't mind the bottom end knock, she'll be right Shit, at first glance I thought the econoguage was a tacho. 6K from cold lol 4 CHESTNUTXE, gerg, Ando81 and 1 other reacted to this Share this post Link to post Share on other sites
CHESTNUTXE 7,300 Posted October 9, 2017 probly has monsta tac Share this post Link to post Share on other sites
matt_lamb_160 252 Posted October 9, 2017 Clearly, I meant pictures indicating the material added and where not to take it away from. Perhaps I should have said "pictures showing...", but you knew what I meant. 2 Outback Jack and ando76 reacted to this Share this post Link to post Share on other sites
broken-wheel 659 Posted October 9, 2017 33 minutes ago, CHESTNUTXE said: probly has monsta tac you don't need a tac, it only scares you Share this post Link to post Share on other sites
matt_lamb_160 252 Posted October 9, 2017 If you can find a worthwhile picture I would like to see it here. If you haven't got one, you haven't got one. 1 slydog reacted to this Share this post Link to post Share on other sites
Drew442 67 Posted October 10, 2017 P.S Matt as soon i get imagine poster unlike photobucket I'll post em. imgur.comSent from my MI 5 using Tapatalk Share this post Link to post Share on other sites
CHESTNUTXE 7,300 Posted October 10, 2017 the chinese alloy crossflow head casting factory is watching this thread with glee,they must have it nearly all done,should be on sale soon,like everything else. 2 Slow250XC and matt_lamb_160 reacted to this Share this post Link to post Share on other sites
broken-wheel 659 Posted October 10, 2017 should be on Alibaba by tomorrow 3 CHESTNUTXE, Outback Jack and Ando81 reacted to this Share this post Link to post Share on other sites
slydog 7,873 Posted October 10, 2017 https://imgur.com/a/i0yV4 1 matt_lamb_160 reacted to this Share this post Link to post Share on other sites
slydog 7,873 Posted October 10, 2017 https://imgur.com/a/DKTKe Share this post Link to post Share on other sites
Slow250XC 1,513 Posted October 10, 2017 Oneday someone will flow an ironhead for shits n giggles. Found plans for a decent bench, now i just need time and money...as per usual lol Edit : changed iron to ironhead. 1 gerg reacted to this Share this post Link to post Share on other sites
CHESTNUTXE 7,300 Posted October 10, 2017 i had a heart attack when ol.m8 at the machine shop gave me a bill for my crossy,spent more than any clevo i have had done,he said althou i wouldnt really understand what mods he did to the head i take his word on it,shit loads of time was spent on it,and when i said do you have a flow bench after getting excited about this 250 cfm flow where the crossy starts to take off ,he said which port do you want me to test at $100 an hour . 3 Outback Jack, ando76 and gerg reacted to this Share this post Link to post Share on other sites
ando76 4,354 Posted October 10, 2017 It's an expensive game playing with them for sure. 2 Outback Jack and CHESTNUTXE reacted to this Share this post Link to post Share on other sites
FORD_MAN 1,026 Posted October 15, 2017 Here's the flow figures from my CNC ported C2 head with 1.84" intake valve, 2 CHESTNUTXE and Outback Jack reacted to this Share this post Link to post Share on other sites
ando76 4,354 Posted October 15, 2017 Solid result there mate. Thanks for sharing. 2 FORD_MAN and Outback Jack reacted to this Share this post Link to post Share on other sites
CHESTNUTXE 7,300 Posted October 15, 2017 for us that are interested in these results but dont no what they mean can someone explain how it reads like the head flows 380hp with so much lift ? is that estimated cam lift ? Share this post Link to post Share on other sites
ando76 4,354 Posted October 15, 2017 Most of the programs have a theoretical horsepower figure based on cfm of flow and a number of other factors. 2 CHESTNUTXE and Outback Jack reacted to this Share this post Link to post Share on other sites
gerg 10,871 Posted October 15, 2017 CFM per port x number of cylinders equals a theoretical maximum power the engine can make using complex efficiency formulas. Doesnt take into account what happens once the inlet valve closes (ie combustion efficiency, etc).Rule of thumb on a V8 is you double the flow number to get HP. 6-cyl multiply by 1.5Sent from my CPH1607 using Tapatalk 2 slydog and CHESTNUTXE reacted to this Share this post Link to post Share on other sites
LJDB 103 Posted October 15, 2017 how much hp would your typical stock alloy head flow? 1 CHESTNUTXE reacted to this Share this post Link to post Share on other sites
CHESTNUTXE 7,300 Posted October 15, 2017 good question i have read a lot of crossy builds where the mildly worked head has plenty of caparbility. Share this post Link to post Share on other sites
ando76 4,354 Posted October 15, 2017 10 hours ago, LJDB said: how much hp would your typical stock alloy head flow? Go back to the very first pages of this thread where Sean flowed a stock head. From there you could use the multiply by 1.5 or use FORDMAN's figures to get a rough idea Share this post Link to post Share on other sites
slydog 7,873 Posted October 17, 2017 On 10/15/2017 at 10:31 PM, CHESTNUTXE said: good question i have read a lot of crossy builds where the mildly worked head has plenty of caparbility. Marusic's 293cfm cyl head shows 439 theoretical hp but made 380 on a engine dyno. Little 2 barrel dirt slinger stuff chokes em up. Share this post Link to post Share on other sites
