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MeXX
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« Reply #150 on: May 20, 2021, 10:26:03 am » |
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More pix...
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MeXX
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« Reply #151 on: May 21, 2021, 07:40:41 am » |
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brewsy
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« Reply #152 on: May 21, 2021, 09:24:57 am » |
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Mexx, The more pictures you show the more amazed I am!!! Questions: Looks like 6x heads. Is a pair for sale??    Wrist/Gudgeon pin. Is it made of two materials or some kind of sleeve?? Cheers Marc |
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MeXX
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« Reply #153 on: May 23, 2021, 20:25:02 pm » |
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Mexx,
The more pictures you show the more amazed I am!!!
Questions:
Wrist/Gudgeon pin. Is it made of two materials or some kind of sleeve??
Cheers
Marc
Dear Marc.... Yep the wrist pins are DLC coated .150 thick tool steel... because of the high RPM and nitrous use they are sleeves with titanium.... Don't get me wrong ... the tool steel won't break but the will flex and get out of round a d wear out the pin bearing and the pistons.... I was running thick wall DLC coated titanium wrist pins.... but when the coating wears.... catastrophic failures can occur.... |
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« Last Edit: May 23, 2021, 20:27:27 pm by MeXX »
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« Reply #154 on: May 27, 2021, 07:17:43 am » |
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Mexx, The more pictures you show the more amazed I am!!! Questions: Looks like 6x heads. Is a pair for sale?? Cheers Marc Dear Marc yep... these heads are for sale too... and yep I have sold a bunch already.... For everybody who is really interested in owning such heads keep the following things in mind.... These heads are for all out racing only... (nope they can not be used for street) These heads flow 408 CFM@ 1.000 lift (V2.3) and 430 CFM @ 1.000 lift (V3) so they can only show their full potential on a engine that demands that amount of flow. These heads can support up to 420hp (V2.3) and 450hp (V3.0) NA, but that does not mean they will produce that amount of power if the engine does not demand that amount of air. So if someone wanna built an unlimited NA engine.... big enough in displacement and high RPM and the valve train rigid and stabile enough for a cam with a lift high enough..... I can guarantee these heads will not be the bottle neck in your setup.... yours... sincerely MeXX Btw.: just forgot.... They are not expensive... just reasonable priced for the technology envolved .... |
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« Last Edit: May 31, 2021, 13:55:18 pm by MeXX »
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brewsy
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« Reply #155 on: May 27, 2021, 09:46:34 am » |
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I can guarantee these heads will not be the bottle neck in your setup....
yours... sincerely
MeXX
Btw.: just forgot....
They are not expensive... just reasonable priced for the technology envolved ....
MeXX, Thanks for that and those numbers, especially the lift, are amazing. Not that Im in a position to buy but anyone complaining about the cost would simply need to see your build thread to understand the incredible amount of RnD and material machining that has gone into them!! Marc |
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« Reply #156 on: May 27, 2021, 12:15:04 pm » |
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I can guarantee these heads will not be the bottle neck in your setup....
yours... sincerely
MeXX
Btw.: just forgot....
They are not expensive... just reasonable priced for the technology envolved ....
MeXX, Thanks for that and those numbers, especially the lift, are amazing. Not that Im in a position to buy but anyone complaining about the cost would simply need to see your build thread to understand the incredible amount of RnD and material machining that has gone into them!! Marc Jep... to max out the displacement is quite easy compared with.. to max out the RPM and the valve lift and keep the valve train stabile... probably the most tricky part.... |
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« Last Edit: May 27, 2021, 12:17:15 pm by MeXX »
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« Reply #157 on: May 28, 2021, 09:43:52 am » |
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« Reply #158 on: May 28, 2021, 10:09:50 am » |
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« Last Edit: May 28, 2021, 10:16:45 am by MeXX »
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ibg
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« Reply #159 on: May 28, 2021, 23:45:02 pm » |
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I love looking at the heads, the pushrod/rocker/valve angles are ingenious. the improvement in the angles everything travels through is amazing.
Do you thread the rocker bolts directly into the aluminium or are there thread inserts, helicoils?
Or are the rockers on studs?
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« Reply #160 on: May 29, 2021, 08:19:27 am » |
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I love looking at the heads, the pushrod/rocker/valve angles are ingenious. the improvement in the angles everything travels through is amazing.
Do you thread the rocker bolts directly into the aluminium or are there thread inserts, helicoils?
Or are the rockers on studs?
Dear Ian... Thx for your for your appreciation of my doing.... All individual rocker axels are just bolted down by two M8 12.9 Allen drive bolts..... The threats go directly in the aluminum of the head without any kind of insert.... But the trick is that these threats are quite long like 25mm (> 6 x d).... The nice side effect is that you just can torque them down with a cordless drill even if you have to preload the valve springs by doing that.... MeXX |
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« Reply #161 on: May 29, 2021, 08:33:13 am » |
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Because of the quite high valve lift of over .900" the height of the rocker stands is .060" or 1.5mm lower than traditional, which is based on the halve lift theories.....
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« Last Edit: May 29, 2021, 08:35:45 am by MeXX »
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« Reply #162 on: May 30, 2021, 07:39:38 am » |
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Some pix of the exhaust and the fabrication...
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« Last Edit: May 30, 2021, 07:46:45 am by MeXX »
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« Reply #163 on: May 30, 2021, 07:52:23 am » |
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due the high temperature it is turning blue...
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MeXX
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« Reply #164 on: June 01, 2021, 11:55:34 am » |
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Fabrication of the inconel header...
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« Reply #165 on: June 01, 2021, 11:58:36 am » |
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« Reply #166 on: June 01, 2021, 12:34:14 pm » |
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MeXX
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« Reply #167 on: June 01, 2021, 12:36:24 pm » |
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MeXX
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« Reply #168 on: June 07, 2021, 07:01:53 am » |
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« Last Edit: June 07, 2021, 07:05:32 am by MeXX »
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MeXX
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« Reply #169 on: June 07, 2021, 07:04:04 am » |
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ibg
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« Reply #170 on: June 07, 2021, 10:28:16 am » |
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The jigs are as beautifully made as the exhaust |
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MeXX
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« Reply #171 on: June 10, 2021, 10:25:18 am » |
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« Last Edit: June 10, 2021, 12:33:07 pm by MeXX »
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MeXX
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« Reply #172 on: June 11, 2021, 07:32:19 am » |
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Later on bungs for 4 individual WBOs were installed....
Material was the same as the tubing.... Inconel 625.... quite hard to machining.... but super durable... and heat resistant.....
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MeXX
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« Reply #173 on: June 11, 2021, 07:35:48 am » |
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MeXX
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« Reply #174 on: July 22, 2021, 09:43:20 am » |
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« Last Edit: July 23, 2021, 08:59:13 am by MeXX »
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Eddie DVK
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« Reply #175 on: July 22, 2021, 13:03:29 pm » |
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Cool vids especially the one inside the car. Maybe I missed this, but how do you change the gears in your gearbox. I see the gearstick moving, which looks funny/strange |
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Regards Edgar
" Type 4, it is a completely different engine. You have to drive one to understand! "
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brewsy
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« Reply #176 on: July 22, 2021, 16:18:54 pm » |
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Cool vids especially the one inside the car. Maybe I missed this, but how do you change the gears in your gearbox. I see the gearstick moving, which looks funny/strange Exactly Eddie. Id guess thats pneumatic actuation (compressed gas of some kind) but is it triggered by the ECU? Also I didnt see a 'trans' brake/line lock so how did you keep the car still and/or preload the gearbox?? Oh and forgot to say awesome run. SUper smooth. Looked like you were going to the supermarket! Cheers Marc |
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MeXX
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« Reply #177 on: July 23, 2021, 07:58:09 am » |
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Hi Volks... yep the gearbox... is a topic at its own.... hope I'll find the time to start a new thread... it is a Porsche G50 converted to Seamless... (Liberty style) the shifter is a homemade vertical gate for going to the staring line and driving back after the run.... for the run it is air shifted... by compressed air from a carbon fiber tank 0.2 liter so you put it into first gear... will work with line lock in the future... as long the line lock is aktivated plus a time of 0.4s the solenoid for the first gear stays engaged to keep the gear from popping out... as soon as the car starts to gain speed, with the rear wheel RPM, the engine RPM ratio and the gear ration, the gear can be calculated... 1. gear detected and shift RPM reached (9200) solenoid for the equal gears is engaged moving the leveler backwards and engaging the 2nd gear in addition to the first... no preload no ignition cut no retard.... just seamless.... as soon as the 2ng gear is engaged the 1st is disengaged... 2. gear detected and shift RPM reached (9200) solenoid for the unequal gears is engaged moving the leveler forwards and engaging the 3rd gear in addition to the 2nd... as soon as the 3rd gear is engaged the 2nd is disengaged... 3. gear detected and shift RPM reached (9200) solenoid for the equal gears is engaged moving the leveler backwards and engaging the 4th gear in addition to the 3rd... as soon as the 4th gear is engaged the 3rd is disengaged... 4. gear detected and shift RPM reached (9200) solenoid for the unequal gears is engaged moving the leveler forwards and engaging the 5th gear in addition to the 4th... as soon as the 5th gear is engaged the 4th is disengaged... sounding weired.... yep it is super tricky and took a while to get it working...
<![CDATA[<a href="http://www.youtube.com/v/RBU-9QF_pnM" target="_blank">http://www.youtube.com/v/RBU-9QF_pnM</a>]]>soon more MeXX |
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« Last Edit: July 23, 2021, 08:59:51 am by MeXX »
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« Reply #178 on: July 25, 2021, 22:07:41 pm » |
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Just AMAZING...  The G50 never seems to have had the best reputation as a smooth box and you've changed it to a proper seamless shifter!! That was a MASSIVE gamechanger in MotoGP and took huge chunks out of circuit records when Honda first introduced it. My only question might be what happens to the shift sequence if you get wheelspin? Wont that cause the revs to spike and also perhaps to lose 'loading' on the gears and upset the mechanism? Cheers Marc |
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MeXX
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« Reply #179 on: July 26, 2021, 12:20:31 pm » |
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Just AMAZING... The G50 never seems to have had the best reputation as a smooth box and you've changed it to a proper seamless shifter!! That was a MASSIVE gamechanger in MotoGP and took huge chunks out of circuit records when Honda first introduced it. My only question might be what happens to the shift sequence if you get wheelspin? Wont that cause the revs to spike and also perhaps to lose 'loading' on the gears and upset the mechanism? Cheers Marc Dear Mark..... yep this was one of my biggest concerns..... but even on burn out in 2nd gear when I hit the rev limiter for a punch of seconds the gear doesn't pop out..... so it looks like it is enough load.... only if you lift the throttle if pops out but you can still pedal the car.... MeXX |
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The Cal-look Lounge
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