 Making the type four rev higher |
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| Trekkor |
  Jun 10 2013, 04:55 PM
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#1
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I do things...  Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California  |
I have a VW Bug race car with a type four motor.
I would like it to safely rev up to 6500-7000 rpms. What is needed to accomplish this? thanks (IMG:http://www.914world.com/bbs2/uploads_offsite/fbcdn-sphotos-c-a.akamaihd.net-1413-1370904931.1.jpg) KT |
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| stugray |
Jun 11 2013, 10:24 PM
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#2
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE Calculate the connecting rod ratio to determine what the projected RPM range should be. Is there a "rule of thumb" for con-rod ratio for these engines? I see that the stock ratio for a 2.0L is about 1.84. It seems simple enough to get to 1.96 by buying 5.5" (~140mm) connecting rods and spacing the cylinders up by ~9mm. That would reduce low end torque while decreasing forces at high RPM. What is the downside of a higher con-rod ratio? Stu |
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Posts in this topic
Trekkor Making the type four rev higher Jun 10 2013, 04:55 PM
ConeDodger Extreme balance. Light driveline components. Ignor... Jun 10 2013, 05:00 PM timothy_nd28 heavy duty valve springs and chrome moly pushrods Jun 10 2013, 05:02 PM The Cabinetmaker My 2056 has the raby valve train kit with stock sp... Jun 10 2013, 05:13 PM DBCooper All kinds of drag racers spinning them faster than... Jun 10 2013, 05:19 PM
ConeDodger
All kinds of drag racers spinning them faster tha... Jun 10 2013, 05:27 PM WLD419 Some might say the right combo :D , I would say ... Jun 10 2013, 05:26 PM Steve Do they make a 3/4 cam for a type 4?
3/4 cam has a... Jun 10 2013, 05:33 PM DBCooper
Do they make a 3/4 cam for a type 4?
3/4 cam has ... Jun 10 2013, 06:05 PM yeahmag A few key components:
* Aftermarket rods
* Caref... Jun 10 2013, 06:11 PM Trekkor This will be for endurance road racing.
I would li... Jun 10 2013, 09:22 PM mittelmotor That looks like the Buttonwillow ChumpCar race. Yo... Jun 10 2013, 11:52 PM Trekkor
That looks like the Buttonwillow ChumpCar race. Y... Jun 11 2013, 02:27 PM messix endurance racing? don't go for high rpm! t... Jun 11 2013, 12:11 AM Mark Henry There are limitations to what a pushrod motor can ... Jun 11 2013, 06:25 AM rick 918-S
There are limitations to what a pushrod motor can... Jun 11 2013, 07:32 AM Racer Chris My backup 1.8L race engine is set up for 6800 rpm ... Jun 11 2013, 07:06 AM WLD419 You should post this question over on the Type4 f... Jun 11 2013, 08:29 AM Trekkor I think our current set-up made 124hp.
Can't r... Jun 11 2013, 02:20 PM Trekkor It's a pretty fun car!
http://www.914worl... Jun 11 2013, 10:13 PM messix weight...
the longer rod will weigh more.
the is... Jun 11 2013, 10:42 PM Trekkor More fun:
http://www.914world.com/bbs2/uploads_of... Jun 11 2013, 11:04 PM Trekkor That's probably my biggest complaint with the ... Jun 11 2013, 11:41 PM Trekkor Dual Webers on the motor, BTW.
KT Jun 11 2013, 11:42 PM messix "floating the valves is not good!!... Jun 11 2013, 11:52 PM stugray
I thought that the problem occurred at the oppos... Jun 12 2013, 01:22 AM messix
I thought that the problem occurred at the oppo... Jun 12 2013, 01:27 PM r_towle You might want to consider a 915 tranny, or a prop... Jun 12 2013, 09:37 AM Mark Henry
You might want to consider a 915 tranny, or a pro... Jun 12 2013, 10:11 AM Trekkor Yes, maybe a 901 tailshifter with a flipped ring a... Jun 12 2013, 08:38 PM brant
Yes, maybe a 901 tailshifter with a flipped ring ... Jun 12 2013, 09:17 PM Trekkor
you don't have to flip it if you use a 911 ... Jun 12 2013, 10:01 PM DBCooper Just a general question, what's the history of... Jun 12 2013, 09:16 PM Trekkor
Just a general question, what's the history o... Jun 12 2013, 10:00 PM messix
Just a general question, what's the history o... Jun 12 2013, 10:11 PM aircooledtechguy If I build a motor to rev higher these are some of... Jun 12 2013, 11:13 PM messix and would you run it for 24hrs in race trim? only... Jun 12 2013, 11:45 PM DBCooper You said "we turned 322 3 mile laps in our 20... Jun 13 2013, 10:29 AM worn
Reason for the T1 suggestion was cost. All the ... Jun 13 2013, 10:45 AM DBCooper
What I think I am saying is that for power, I am ... Jun 13 2013, 03:04 PM Trekkor
You said "we turned 322 3 mile laps in our 2... Jun 13 2013, 01:23 PM yeahmag I would completely disagree from experience. My Ty... Jun 13 2013, 10:54 AM DBCooper Well, the T4 IS a truck motor, so it makes sense t... Jun 13 2013, 12:43 PM Racer Chris I averaged over 60 mph for 1000 miles the last tim... Jun 13 2013, 01:23 PM Trekkor We missed our class win by two laps.
We were doin... Jun 13 2013, 05:12 PM stugray
I drove my 914 back & forth from Oklahoma Ci... Jun 13 2013, 05:28 PM messix wow really guys :stooges: ... you cant compare cru... Jun 13 2013, 05:53 PM DBCooper That is SO cool. Well done. I don't know wha... Jun 14 2013, 08:10 AM sean_v8_914 you must manage the FORCE
force = mass x accelera... Jun 14 2013, 11:24 AM sean_v8_914 lots of cool valve float videos on youtube Jun 14 2013, 11:31 AM Trekkor better view of the duct work!:
http://www.914... Jun 14 2013, 12:37 PM DBCooper Wow, reinforced bumpers welded on, looks like disc... Jun 14 2013, 01:22 PM Trekkor Let's see if i can find some shots of the vent... Jun 14 2013, 01:42 PM Trekkor http://www.914world.com/bbs2/uploads_offsite/i944.... Jun 14 2013, 04:42 PM sean_v8_914 so I had to look at all teh pics on thet link, of ... Jun 15 2013, 10:08 AM sean_v8_914 that breather box is qustom HDR. the electrical co... Jun 15 2013, 10:13 AM Trekkor Exactly!
KT Jun 15 2013, 11:33 AM |
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