Author Topic: Performance engines  (Read 9205 times)

Offline Lazy Dog

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Performance engines
« on: July 23, 2008, 09:19:40 PM »
Is there anyone specialising in building performance air-cooled engines over here or is there not the demand? 'Spose it's easier to pop over to the UK for engines and parts, would just be interested to know. I know David Sheane builds 1600's for the Formula Sheane cars but that's about it.....?
Anyone running anything interesting (except Roger of course)! Roger if you're reading this post up the spec on your engine again would you, some pics might be nice as well....Ta.
Kernow bys vyken

Offline Roger

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Re: Performance engines
« Reply #1 on: July 24, 2008, 09:54:38 AM »
Anyone running anything interesting (except Roger of course)! Roger if you're reading this post up the spec on your engine again would you, some pics might be nice as well....Ta.



2332 Scat, twin 58's, Porsche cooling, MSD Ignition.

Offline Lazy Dog

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Re: Performance engines
« Reply #2 on: July 24, 2008, 11:23:17 PM »
Thank you Roger, a thing of beauty! Any figures.... est. bhp.....torque etc... what's it like to drive?
Kernow bys vyken

Offline Roger

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Re: Performance engines
« Reply #3 on: July 25, 2008, 11:23:54 AM »
Thank you Roger, a thing of beauty! Any figures.... est. bhp.....torque etc... what's it like to drive?

Only 160 BHP so plenty of torque.  I thought that my 112 BHP T3 was fast but I was wrong ...  :D

Offline Lazy Dog

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Re: Performance engines
« Reply #4 on: July 25, 2008, 12:21:44 PM »
Thank you Roger, a thing of beauty! Any figures.... est. bhp.....torque etc... what's it like to drive?

Only 160 BHP so plenty of torque.  I thought that my 112 BHP T3 was fast but I was wrong ...  :D
Only 160 BHP eh..... bet you must be struggling with that ;)
Here's one of mine....

Pretty much stock except for twin 34 ICT'S, give a bit extra which is nice! Gonna try and get round to dropping the engine this weekend...... petrol leak and dodgey fuel sender dammit!!!! It's never ending!
Kernow bys vyken

Offline rony

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Re: Performance engines
« Reply #5 on: July 25, 2008, 09:08:23 PM »
LD is that a stock 1600. what bhp can you get out of that with you modifications??

Offline mushroom

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Re: Performance engines
« Reply #6 on: July 25, 2008, 11:40:37 PM »
more bhp without that monza exhaust, they are actually more restrictive than a stock exhaust  ;D

Offline Lazy Dog

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Re: Performance engines
« Reply #7 on: July 26, 2008, 01:21:57 AM »
LD is that a stock 1600. what bhp can you get out of that with you modifications??
Howdy Rony, definately punchier than with the single carb, all stock apart from that, pulls well up to 70 and happy enough going beyond, pulls up hill as well!! Didn't ever have it on a dyno so don't have BHP figures, sorry.
Mushroom, was gonna post a topic about exhausts, have to admit have never really been convinced with the Monza...but then never really thought they were that bad either?? Any recommendations?
Kernow bys vyken

Offline Roger

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Re: Performance engines
« Reply #8 on: July 26, 2008, 10:09:21 AM »
LD is that a stock 1600. what bhp can you get out of that with you modifications??
Howdy Rony, definately punchier than with the single carb, all stock apart from that, pulls well up to 70 and happy enough going beyond, pulls up hill as well!! Didn't ever have it on a dyno so don't have BHP figures, sorry.
Mushroom, was gonna post a topic about exhausts, have to admit have never really been convinced with the Monza...but then never really thought they were that bad either?? Any recommendations?

Simpson Race Exhaust  >:D

Offline ex-2cv-er

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Re: Performance engines
« Reply #9 on: July 26, 2008, 05:02:05 PM »
Pretty much stock except for twin 34 ICT'S, give a bit extra which is nice!

Identical to the engine in my yellow beetle then?  Except you've got some shiny bits  ;D

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Offline Lazy Dog

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Re: Performance engines
« Reply #10 on: July 26, 2008, 06:24:21 PM »
Pretty much stock except for twin 34 ICT'S, give a bit extra which is nice!

Identical to the engine in my yellow beetle then?  Except you've got some shiny bits  ;D


Yep, pretty much 'cept you got a fancy oil breather and a proper dizzy cap.... and mine's pushing a bus :D
 Any more thoughts on exhausts anyone...... maybe start a new topic?
Kernow bys vyken

Offline gerry junior

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Re: Performance engines
« Reply #11 on: July 26, 2008, 09:19:45 PM »
excuse my ignorance ,but do those carbs have a choke system..and are they much heavier on fuel...

Offline ex-2cv-er

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Re: Performance engines
« Reply #12 on: July 26, 2008, 09:25:02 PM »
excuse my ignorance ,but do those carbs have a choke system..and are they much heavier on fuel...

No chokes on my Webers.  And nothing to compare with fuel wise (my bus is diesel, the black beetle is off the road, and the pickup is not only off the road, but also sports twin Kadrons), but the yellow Beetle is exceptionally good on fuel, better than it really should be...so no complaints there  :D
Caroline - North Tipp

This summer I am mostly being a...Crusty Festival Trader :)
Incense etc - Are Ewe Curious?

Offline Lazy Dog

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Re: Performance engines
« Reply #13 on: July 27, 2008, 10:06:38 AM »
excuse my ignorance ,but do those carbs have a choke system..and are they much heavier on fuel...

No chokes on my Webers.  And nothing to compare with fuel wise (my bus is diesel, the black beetle is off the road, and the pickup is not only off the road, but also sports twin Kadrons), but the yellow Beetle is exceptionally good on fuel, better than it really should be...so no complaints there  :D
No chokes on mine either.... pops and farts a bit on start up but settles down pretty quickly, give it 5 mins warm up and you're away! Bit difficult to estimate MPG, so many variables... hills, whether you're happy cruising at 60 or are in a bit of a hurry and pushing 70/75, wind direction, broken fuel gauge, load, the condition of your engine in general, the list could go on and on, but they are supposed to improve fuel economy (dunno tho') and definately improve performance!
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Offline trev

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Re: Performance engines
« Reply #14 on: July 28, 2008, 01:47:15 AM »
Bit difficult to estimate MPG, so many variables... hills, whether you're happy cruising at 60 or are in a bit of a hurry and pushing 70/75, wind direction, broken fuel gauge, load, the condition of your engine in general, the list could go on and on, but they are supposed to improve fuel economy (dunno tho') and definately improve performance!

Despite all the factors you've mentioned, it's really easy to calculate your fuel economy. For example, starting tomorrow, fill up the tank of your van and record the starting mileage on the odometer (ignore how many litres it took on the initial fill, just be sure to fill it). Drive the van for a month, you're sure to encounter all types of driving conditions from slow city traffic to open roads, to hills, to motorways to traffic-light-grand-prix. Keep filling up the van each time you refuel and record how many litres it took each time. After the month fill up the tank one last time and record how many litres it took and record the final mileage before leaving the petrol station. Add up all the litres of fuel you put into it (remember, ignore the initial fill, you just want to add up the fuel you had to replace to return it to a full tank), subtract the starting mileage from the final one to determine the total mileage covered, do some sums and work out your miles per gallon. Once you know this (and it'll be a good average of your month's driving) you'll know how far you can drive before refuelling, even if your fuel tank sender is broken, it's called your "range".

Both the fuel economy and your range are useful to know as you don't want to venture out into the wilds if you've only got a quarter tank left and you don't know where the next station will be.

oh, add-ons like carbs don't necessarily make your motor a "performance" engine. My bug's engine is stock except for the 4-1 header and stainless "turbo" style muffler, my van's engine is stock except for the twin 34ICT webers. I wouldn't consider either of them "performance engines. To me, a performance engine is one which has had major surgery to squeeze out a lot more horsepower than the factory intended. To me, "performance" modifications include stroker cranks, counterweighted cranks, balanced rods and pistons, larger pistons and cylinders, increased compression ratio, different cams, ratio rockers, bigger valves, matched ports, etc etc etc. The list is almost endless and usually ENDS with carbs and exhaust after all the other stuff has been done. To that end, the motor in Roger's samba is probably one of the few true "performance" engines in the country. I wish I had the money and know-how to build myself a performance engine. Maybe one day ::) ;)

another thing, the old "buttcheek dyno" is notoriously inaccurate when determining the benefits of engine modifications ;D