| [ Total Views: 2221 | Total Replies: 42 | Thread Id: 63307 ] |
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 Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
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| posted on June 26th, 2007 at 06:20 PM |
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| Quote: | Originally
posted by pete wood
wow bix, you know the regs better than me. thanx
dave, I was hoping you comment at some stage. One question, are ally cases available for 85.5-87 mm bore size or do they start larger than that?
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you can buy them for a standard bore size.
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Jeza
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| posted on June 26th, 2007 at 07:45 PM |
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What ally cases do people recommend?
Or have they all sorted out their teething problems??
......random gibberish for today.......
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hellbugged
A.k.a.: Daimo Pell
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| posted on June 26th, 2007 at 08:10 PM |
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what stroke and bore are you thinking of to come in just under 1600cc Pete?
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pete wood
A.k.a.: figure itout
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| posted on June 27th, 2007 at 09:55 AM |
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The motor has to be standard stroke. So 69mm. Basically 1600, but bore wise things get interesting. If I go historic I can put 87mm pots on a 1600 and
still be counted within the class as it's within the 1.5mm overbore allowed. This is to allow people to use old engine blocks. VWs get a loophole
here.
In group 3c-PRC I have to stay within 0.6mm window and I can't exceed the capacity limit of the class. I'm aiming an updated replica of
this...http://www.rallybugs.com/engtrans.htm. They had 85.9mm bores. Could I just machine some 87s down?
[ Edited on 27-6-07 by pete wood ]
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BiX
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| posted on June 27th, 2007 at 11:44 AM |
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You can change the capacity of the engine in regular PRC as its a pre 86 car... you jsut change classes..... Stroke and Bore are free..... as long
as it fits in the homoglated engine block... eg a std mag case....
Mite be worth fully reading the regs front to back and taking notes on them. Almost like studying for an exam. Cross out old regs and add new as you
read through.
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
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pete wood
A.k.a.: figure itout
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| posted on June 27th, 2007 at 12:54 PM |
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either way, I'll be sticking with the 69mm crank. They're cheap, you can't go wrong with them and pistons aren't that hard.
might be right about reading the regs, I'm not a good detail person so it's gonna mean spending lots of time getting it right.
BTW, just had a quick look at the 4ag bore vs stroke; 81mm vs 77mm. So the stocker 1600 has a better ratio than the 4ag in terms of revving from my
understanding of racing engines.
[ Edited on 27-6-07 by pete wood ]
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on June 28th, 2007 at 08:53 AM |
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| Quote: | Originally
posted by pete wood
BTW, just had a quick look at the 4ag bore vs stroke; 81mm vs 77mm. So the stocker 1600 has a better ratio than the 4ag in terms of revving from my
understanding of racing engines.
[ Edited on 27-6-07 by pete wood ]
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The 4A series engines, particularly the 5 valve one, will out flow a VW by heaps (or more in standard form).
The bore stroke ratio and rod length discussions are very little in the scheme of things when it comes to reving,
so long as you are within some basic real guidelines.
Airflow and valve control is king when it comes to rpm potential and power.
| Quote: | Originally
posted by westi
That's mad Alan.
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pete wood
A.k.a.: figure itout
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| posted on June 28th, 2007 at 01:12 PM |
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ok, so the heads are the key then.
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pete wood
A.k.a.: figure itout
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| posted on June 28th, 2007 at 07:41 PM |
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just found this on the Gene Berg site.
http://www.geneberg.com/cat.php?cPath=22_503_2984
very interesting reading. The engine will be getting a new case. 
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Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
6 times Australian, 7 times State Hillclimb Class Champion
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| posted on June 28th, 2007 at 08:10 PM |
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Good propaganda for selling new cases! :thumb
or for admitting the fact that machining a case accurately can only be performed by a small minority of engine builders.
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pete wood
A.k.a.: figure itout
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| posted on June 28th, 2007 at 10:39 PM |
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he also said shuffle pins and welding up the back of cyl3 is a bad idea.
what do you think?
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hellbugged
A.k.a.: Daimo Pell
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| posted on June 28th, 2007 at 11:10 PM |
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.........fancy someone writing down and publishing, for all to see, their findings after 30 years of research, testing and
development..........pfffffffft
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Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
6 times Australian, 7 times State Hillclimb Class Champion
Posts: 8040
Threads: 347
Registered: January 10th, 2003
Member Is Offline
Location: Sydney
Theme: UltimaBB Pro Blue ( Default )
Mood: Time to go Salt lake racing, and actually achieve a result.
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| posted on June 29th, 2007 at 05:18 PM |
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there's plenty of documented incorrect information out there.
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