 Seing double?, Now tested double D-jet performance! |
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| larss |
 Jan 10 2014, 01:35 AM
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#1
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Member  Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia  |
Anybody tried double D-jet air boxes and TB before?
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.lsmteknik.se-10787-1389339349.1.jpg) /Lars S |
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| Olympic 914 |
May 5 2014, 01:33 PM
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#2
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Group: Members Posts: 1,675 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States 
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What about just using the 2.0 plenum? it is larger, then just add the 2.0 throttle body. I don't know the size difference between the 1.7 and 2.0 throttle bodies.
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| larss |
May 5 2014, 01:43 PM
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#3
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Member Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia |
QUOTE(Olympic 1.7 @ May 5 2014, 09:33 PM)  What about just using the 2.0 plenum? it is larger, then just add the 2.0 throttle body. I don't know the size difference between the 1.7 and 2.0 throttle bodies. Yes thats a good idea, I think many have done that on 1911cc's. Best would be to use the larger 2.0 intake pipes also (and heads of course). I just happened to have another 1.7 d-jet plenum and throttle body and wanted to make a test. /Lars S |
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| JamesM |
May 5 2014, 04:35 PM
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#4
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Senior Member Group: Members Posts: 1,915 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
QUOTE(larss @ May 5 2014, 11:43 AM) QUOTE(Olympic 1.7 @ May 5 2014, 09:33 PM) What about just using the 2.0 plenum? it is larger, then just add the 2.0 throttle body. I don't know the size difference between the 1.7 and 2.0 throttle bodies. Yes thats a good idea, I think many have done that on 1911cc's. Best would be to use the larger 2.0 intake pipes also (and heads of course). I just happened to have another 1.7 d-jet plenum and throttle body and wanted to make a test. /Lars S Neat to see that you actually got a power increase from the larger TB area. I increased the size of the TB on my latest build as well but was not sure if it made any difference. I have run a 1.7 plenum/TB/Runners on a 2.0 before and it definitely restricts the power. From what I recall (and don't quote me on this) 1.7 TB ~37mm (also smaller runners and much smaller plenum) 1.8 TB ~45mm (same size runners as 2.0) 2.0TB ~46mm (largest stock TB, same size runners as a 1.8 but intake layout causes turbulence. Also 3 bolt runners vs 1.7 and 1.8 4 bolt) The 2.0 intake requires a bit of hacking to fit on a 1.7, and still has its problems. My solution, still looks stock and gets you a total throttle plate area pretty close to what you get with dual 1.7s, and also you keep equal length runners with the larger diameter. 1.8 plenum with the TB opening stretched to 52MM, + modified 50MM vanagon TB: total throttle plate area 1962mm^2 on top of a 2056, does not seem to be lacking for air on the top end at all     |
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Posts in this topic
larss Seing double? Jan 10 2014, 01:35 AM
Racer Chris Mine's a little different than what your pictu... Jan 10 2014, 07:42 AM
larss
Mine's a little different than what your pict... Jan 10 2014, 08:34 AM Racer Chris
any D-jet tuning tips to make double TB's wor... Jan 10 2014, 11:17 AM brant We have a racer out here running 4 diet throttle b... Jan 10 2014, 07:55 AM larss Thanks!
I thought of making the linkage so tha... Jan 10 2014, 12:04 PM Racer Chris
Thanks!
I thought of making the linkage so th... Jan 10 2014, 12:11 PM AE354803
Anybody tried double D-jet air boxes and TB befor... Jan 10 2014, 01:26 PM larss
[quote name='larss' post='1981369' date='Jan 9 20... Jan 12 2014, 07:30 AM Brian Mifsud So what do you gain with Double Throttle Bodies an... Jan 10 2014, 04:11 PM larss
So what do you gain with Double Throttle Bodies a... Jan 10 2014, 11:25 PM r_towle I am in love with this hack.
Please explain why an... Jan 10 2014, 08:55 PM ClayPerrine Why not split two plenums down the middle at the s... Jan 12 2014, 08:31 AM r_towle
Why not split two plenums down the middle at the ... Jan 12 2014, 09:10 AM larss
Why not split two plenums down the middle at the... Jan 12 2014, 11:11 AM larss
Why not split two plenums down the middle at the ... Jan 12 2014, 11:14 AM ChrisNPDrider
I am still curious as to why someone would do thi... Jan 12 2014, 11:02 AM MrLeeS Neat idea, but I don't see any benefit in your... Jan 12 2014, 11:53 AM larss
Neat idea, but I don't see any benefit in you... Jan 12 2014, 12:00 PM AE354803
Neat idea, but I don't see any benefit in yo... Jan 12 2014, 02:53 PM larss At last, after running in my new 1911 Engine I hav... May 5 2014, 07:51 AM ChrisNPDrider Cool! Thanks for sharing :beer2:
I'll ad... May 5 2014, 09:37 AM Dr Evil This is fricken cool :) Good on you for trying thi... May 5 2014, 10:53 AM larss
This is fricken cool :) ....
The volume of your ... May 5 2014, 11:00 AM larss Good ideas JamesM!
How do you match the vanag... May 5 2014, 10:47 PM JamesM
Good ideas JamesM!
How do you match the vana... May 6 2014, 11:12 AM larss Thanks JamesM!
Are we talking about a TB type... May 6 2014, 11:34 AM JamesM
Thanks JamesM!
Are we talking about a TB typ... May 6 2014, 05:27 PM JamesM
Thanks JamesM!
Are we talking about a TB ty... May 6 2014, 05:45 PM larss Thanks JamesM!
/Lars S May 6 2014, 10:44 PM |
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