 Type 4 mechanical compression ratio, Why is the factory compression so low? |
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| Beebo Kanelle |
 Feb 11 2016, 01:03 PM
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Member  Group: Members Posts: 248 Joined: 22-November 12 From: Houston, Texas Member No.: 15,177 Region Association: Southwest Region 
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OK, here's a fun one for the novice to ponder and you experts to answer:
Why is the factory mechanical CR so low? and for reference, what is the highest mechanical CR that can be physically achieved? assume no octane limitations - I'm just looking for the design limit for the highest CR that can be / has been in a Type 4 engine using available technology. Thanks |
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| r_towle |
Feb 11 2016, 04:14 PM
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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13:1 at 200 hp
Race fuel only. Could not move the car under 4500 rpms... built tuned between 5500-7500 rpms. stupid to drive anywhere aside from racing. As Jake always says, its all in the combo. He gets 200hp on pump fuel now.... The thing to remember is that higher CR creates heat...the worst enemy of an aircooled motor. Rich |
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Posts in this topic
Beebo Kanelle Type 4 mechanical compression ratio Feb 11 2016, 01:03 PM
914_teener
OK, here's a fun one for the novice to ponder... Feb 11 2016, 01:27 PM Mark Henry Kind of funny way of asking what is the max HP a T... Feb 11 2016, 02:19 PM colingreene Compression ratio is often set by quality of fuel.... Feb 11 2016, 02:22 PM Dave_Darling Assuming you aren't actually trying to burn an... Feb 11 2016, 04:10 PM Beebo Kanelle Thank you one and all.
I'm afraid I wasn... Feb 11 2016, 04:35 PM
Steve Pratel
Thank you one and all.
I'm afraid I wasn... Feb 11 2016, 10:11 PM
Mark Henry
I'm sure it can be done, and maybe has, but ... Feb 11 2016, 10:35 PM jd74914
I am modeling the Type 4 based upon other engines... Feb 12 2016, 10:27 AM jmill IMHO twin plugging and race gas are exotic extreme... Feb 11 2016, 07:12 PM brant The materials used in a stock 914 engine do not li... Feb 11 2016, 07:39 PM ConeDodger
The materials used in a stock 914 engine do not l... Feb 11 2016, 09:06 PM Mark Henry
The materials used in a stock 914 engine do not ... Feb 11 2016, 09:20 PM ConeDodger
[quote name='ConeDodger' post='2301947' date='Feb... Feb 12 2016, 12:17 AM Mueller The cooling, or lack of is why such low compressio... Feb 11 2016, 10:07 PM Beebo Kanelle Thank you all for all your input. I knew that the... Feb 11 2016, 11:04 PM stugray
So to sum up, the enemy that needs to be addresse... Feb 11 2016, 11:53 PM Mark Henry
So to sum up, the enemy that needs to be address... Feb 12 2016, 03:07 AM Steve Pratel Eh, I'm not buying it.
Driveable? Porsche sol... Feb 12 2016, 10:33 AM McMark If you're looking to improve thermodynamic eff... Feb 12 2016, 09:50 AM Mark Henry
If you're looking to improve thermodynamic ef... Feb 12 2016, 10:21 AM jd74914
If you're looking to improve thermodynamic ef... Feb 12 2016, 10:25 AM ra272
If you're looking to improve thermodynamic ef... Feb 15 2016, 03:36 PM Mark Henry
If you're looking to improve thermodynamic e... Feb 15 2016, 03:54 PM Beebo Kanelle guys! I didn't mean to start a firestorm ... Feb 12 2016, 12:12 PM Mark Henry
guys! I didn't mean to start a firestorm... Feb 12 2016, 01:40 PM jd74914
guys! I didn't mean to start a firestorm... Feb 12 2016, 03:50 PM Mueller You really cannot model the Type IV using past mot... Feb 12 2016, 12:16 PM Beebo Kanelle probably not, it may all blow up - but I do want t... Feb 12 2016, 12:24 PM Beebo Kanelle and, if it all blows up, Y'all will be among t... Feb 12 2016, 12:29 PM brant seriously.... as a hypothetical discussion you can... Feb 12 2016, 02:30 PM r_towle I would suggest you call around, talk with JAke Ra... Feb 12 2016, 03:23 PM HAM Inc If your goal is 100hp/liter T4 you're best cha... Feb 12 2016, 04:17 PM veekry9 zcPGfjUO3Yg
https://www.youtube.com/user/Grasshut... Feb 12 2016, 07:19 PM Mark Henry
The 380hp corvair engine, with the coin in it you... Feb 12 2016, 09:32 PM r_towle I admire what you are doing, and that you can do i... Feb 12 2016, 09:39 PM Beebo Kanelle wow! Thanks to all for all the input.
to an... Feb 12 2016, 10:00 PM Mark Henry
wow! Thanks to all for all the input.
to a... Feb 13 2016, 10:56 AM DBCooper
[b]In VW beetles, T4 upright fan conversions the ... Feb 13 2016, 12:20 PM Mark Henry
[quote name='Mark Henry' post='2302557' date='Feb... Feb 13 2016, 12:47 PM r_towle Look at how the 911 turbo seals the head to cylind... Feb 12 2016, 10:18 PM Mark Henry
Look at how the 911 turbo seals the head to cylin... Feb 13 2016, 11:55 AM colingreene Is this thread still going? I lost interest in try... Feb 13 2016, 11:46 AM stugray It might have been lost in the thread:
If you wan... Feb 13 2016, 12:32 PM DBCooper Yup, original OPP with Joe's handwritten instr... Feb 13 2016, 04:08 PM Mark Henry
Yup, original OPP with Joe's handwritten inst... Feb 13 2016, 04:35 PM DBCooper
Yup, original OPP with Joe's handwritten ins... Feb 13 2016, 05:01 PM veekry9 vmkKqVc2g0s
http://www.forestcitycastings.com/serv... Feb 14 2016, 05:14 AM Mueller
Design brief:
1) air/liquid cooled hybrid
2) ... Feb 14 2016, 03:30 PM Mark Henry
Maybe I missed it, but I didn't see him pos... Feb 14 2016, 04:20 PM veekry9 http://www.amazon.ca/Air-Cooled-Motor-Engi...%2C+L... Feb 14 2016, 08:32 AM Mark Henry OK then....enough of the yakety yack...Build it... Feb 14 2016, 09:38 AM veekry9 https://www.google.ca/webhp?sourceid=chrome...mpos... Feb 14 2016, 11:01 AM Beebo Kanelle Thanks Veekry9! Found a 2nd edition (1972) o... Feb 14 2016, 11:14 AM Mark Henry
Thanks Veekry9! Found a 2nd edition (1972) ... Feb 14 2016, 01:01 PM Beebo Kanelle Thank you, Mueller -
I just have some ideas that ... Feb 14 2016, 04:10 PM veekry9 That's the beauty of the freedom of free will,... Feb 15 2016, 12:27 AM Mark Henry
That's the beauty of the freedom of free will... Feb 15 2016, 08:44 AM Beebo Kanelle Its getting done...
maybe not on a Canadian sch... Feb 15 2016, 09:35 AM Steve Pratel :popcorn: Feb 15 2016, 02:53 PM cgnj Please let this thread die Feb 15 2016, 03:20 PM 914_teener
:popcorn:
:bullshit: :idea: :toke: :sleep: Feb 15 2016, 03:21 PM |
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