The Cal-look Lounge
Welcome, Guest. Please login or register.
Did you miss your activation email?
May 29, 2020, 21:14:22 pm

Login with username, password and session length
Thank you for your support!
Search:     Advanced search
345043 Posts in 27583 Topics by 6458 Members
Latest Member: Mangokid revival
* Home This Year's European Top 20 lists All Time European Top 20 lists Search Login Register
+  The Cal-look Lounge
|-+  Cal-look/High Performance
| |-+  In Da Werks
| | |-+  The eternal rebuild
« previous next »
Pages: 1 ... 5 6 [7] Print
Author Topic: The eternal rebuild  (Read 50395 times)
richie
Hero Member
*****
Posts: 5423



« Reply #180 on: May 29, 2019, 07:19:09 am »

Nice write up Pete, sucks it happened, going to put my money on a lifter failure, they don't like sitting on limiter for long, am actually surprised you got it set so low? was thinking it would be up around 11k for hard limiter

cheers Richie
Logged

Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
brewsy
Full Member
***
Posts: 201



« Reply #181 on: May 29, 2019, 13:33:59 pm »

Desmodromic for the win 😁👍

Now THATS an idea..
4x Ducati heads??

The 851/916 both had 94mm bores and the 4 valve Ducks had a decent cylinder head design (rather than the 2 valve hemisphericals).
Only problems I see would be a) getting them to fit b) adding water cooling to all 4 and getting them to seal on the barrels c) getting drive belts to run them and d) passing drive through one head to the other (unless JP used 4 belts?)..
Apart from that it sounds like a right easy job  Wink Cool

Would sound AMAZING Im sure
Logged
Peter Shattock
Sr. Member
****
Posts: 316


« Reply #182 on: May 29, 2019, 17:33:49 pm »

Brewsy

No drama re the engine. As I said, the reality is Iíve been very lucky that it happened when it did. I donít like to think what it might have done at 9,700rpm at the end of the track!

The cooling is a little something Iíd been working on since the original plan was made to make a 10,000 rpm efi street engine. I was told you have to have at least 12v to keep all the electrical stuff happy so wanted to run with the fan belt and a decent alternator. I obviously didnít want the losses of running the fan on the end of the alternator shaft though.

The last time I raced at EBI this was highlighted when I struggled to get into the 11ís with the fan belt on with the old engine and ran mid 11ís when I took it off. I knew there was no way I could afford to give away 0.5 of a second and it was only going to get worse when you consider I was  planning on running with around an extra 2,000rpm!

You may know some modern cars decouple various belt driven non critical ancillaries when the ecu detects full throttle. This got me thinking if I could do this with the fan.

What I have done is not that sophisticated, but allows me to switch the cooling fan on and off when I want with a switch.

In basic terms there is an electromagnetic clutch like the ones you see on air conditioning pumps on the end of the alternator shaft that either runs the fan or lets it free spin on a bearing when itís not required.

It all sounds simple, but it actually proved to be a serious pain in the backside to get it packaged as there is not a lot of room, but itís great now it works. What I really wanted was something you canít see and as no one has noticed it to date that appears to have been a success. Perhaps if I hadnít written it here maybe no one would have noticed as the only visible clue is a wire coming out of the alternator back plate and off round the back of the fan shroud.

The problem is alternator alone costs a small fortune now (I bought mine years ago) and with the clutch on it I suspect itís about the most expensive ACVW alternator known to man! That is nothing to be proud of, but all I can say is if there is anyone else stupid enough to want to do it good luck!

Hereís a picture. Donít shoot me as I have already been lambasted about the alternator strap by the fashion police so holes like the old one on the 1795 engine and a ti nut and bolt are on the way and yes the nut and both will be at the bottom.

[ Attachment: You are not allowed to view attachments ]

Plan C is simple new cam and pistons. The main issue being the cam as you suggest, but the cam in the motor now is the original one which we lost control of at about 8,500 rpm. We now have lighter pushrods and more spring pressure so the engine is good for 10,000 rpm with the same cam. As it turns out neither this cam or the subsequent one is quite where it needs to be, but we have now hopefully proved that the lighter pushrods and new springs have survived, which gives us a bigger safe operating window to design a cam within which is closer to optimum than either of the two we have tried to date. That said what I have come to realise is that actually getting it right where it needs to be is all but impossible. We are hopefully learning though and getting closer to the ideal cam with what we now know about the two tried to date.

Iím certainly looking forward to cam number 3 though, but donít be surprised if there is a 4th.

Vwhelmot, no fancy valve train configuration changes coming for me.

For some inadequately explained reason I like keeping it just as VW intended with just a bit of a twist

Peter
Logged

The fastest blue beetle in the village
Peter Shattock
Sr. Member
****
Posts: 316


« Reply #183 on: May 29, 2019, 19:54:58 pm »

Hi Richie,

I hope itís not a lifter for various reasons, but not least of all as if broken bits of ceramic lifter go for a dance round your engine it makes a real mess of most of it! The single cylinder motor tells that tale unfortunately...... weíll see, but I hope youíre wrong!

P
Logged

The fastest blue beetle in the village
Peter Shattock
Sr. Member
****
Posts: 316


« Reply #184 on: May 29, 2019, 20:23:21 pm »

[ Attachment: You are not allowed to view attachments ]

Whatís going on in there then....
Logged

The fastest blue beetle in the village
Peter Shattock
Sr. Member
****
Posts: 316


« Reply #185 on: May 29, 2019, 20:24:25 pm »

[ Attachment: You are not allowed to view attachments ]

The end result
Logged

The fastest blue beetle in the village
Peter Shattock
Sr. Member
****
Posts: 316


« Reply #186 on: May 29, 2019, 20:29:50 pm »

[ Attachment: You are not allowed to view attachments ]

Caught up with Martin and all things NSU during the long wait in the fire up lane.
Logged

The fastest blue beetle in the village
leec
Hero Member
*****
Posts: 2331


« Reply #187 on: May 29, 2019, 20:33:18 pm »

Did you get him to decide on a colour  Huh Roll Eyes Grin

Lee
Logged

O/FF 26
DaveN
Sr. Member
****
Posts: 409



« Reply #188 on: May 29, 2019, 20:38:02 pm »

[ Attachment: You are not allowed to view attachments ]

Caught up with Martin and all things NSU during the long wait in the fire up lane.

Sounds like a form of torture
Logged

Best ET 10.64 @125 on DOT street tyres, a long time ago
richie
Hero Member
*****
Posts: 5423



« Reply #189 on: May 30, 2019, 06:58:51 am »

No wonder it broke Angry   Was thinking some more and reckon you would have seen something in valve train if lifter broke badly so maybe not that Smiley
Logged

Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
Eddie
Hero Member
*****
Posts: 754



« Reply #190 on: May 30, 2019, 07:17:03 am »

Man, that fan solution is ingenious.
Logged

Regards Edgar

" Type 4, it is a completely different engine. You have to drive one to understand! "
alex d
Hero Member
*****
Posts: 973



« Reply #191 on: May 30, 2019, 10:40:33 am »

The clutched fan is brilliant, thought about something along those lines many times but never really figured out how to package it, great work!
Logged
Peter Shattock
Sr. Member
****
Posts: 316


« Reply #192 on: May 31, 2019, 15:08:37 pm »

Poor old Martin.... no colour, I just told him to put it together and use it! It did save me doing a Big Pete and falling asleep though, good point about the breakage though, in the absence of anyone else to blame it does make good sense to blame him!

Alex / Eddie, itís a good solution if a bit heavy for the weight conscious. You could even use it as an F1 style overtake mode on the street if you come across a particularly troublesome ricer.

I do wonder if I might not have been better off running a bigger battery and whip the belt off at the start line and save some weight on the car and kept it in my wallet, but itís done now.

Peter
Logged

The fastest blue beetle in the village
dangerous
Sr. Member
****
Posts: 263


« Reply #193 on: August 22, 2019, 22:56:10 pm »

https://www.youtube.com/watch?v=K8E_zMLCRNg
Logged
dangerous
Sr. Member
****
Posts: 263


« Reply #194 on: April 03, 2020, 00:29:38 am »

What is the latest Pete? I am sure I am not alone in anticipation!! 
 Smiley
Logged
Pages: 1 ... 5 6 [7] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!