ROW cis versus us cis OR 240 versus 310 HP cis differences
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Burning Brakes
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ROW cis versus us cis OR 240 versus 310 HP cis differences
Hey R'listers:
Ok so I've searched, dug and lurked and I cannot find a direct answer to a relatively simple question:
What are the differences between a US CIS versus and ROW CIS systems?
From what I have read thus far all I can find is ROW intake runners are larger. So Taking major components are there any differences in:
1) Fuel pump(s)
a) Are there always dual pumps (pre-pump) in 300+ HP systems?
2) Fuel accumulator
3) Fuel filter
4) System pressure regulator and topping valve
5) WUR
6) Airflow meter
7) Sensor plate
8) Throttle body and butterfly
9) Fuel distributor
10) Outlet nipples
11) Injectors
12) Intake runners
It would be great if we could get this answered in a single short thread. Especially for guys like me who are putting an m28.22 into a 1978 ROW car
Thanks,
Fronkensteen
Ok so I've searched, dug and lurked and I cannot find a direct answer to a relatively simple question:
What are the differences between a US CIS versus and ROW CIS systems?
From what I have read thus far all I can find is ROW intake runners are larger. So Taking major components are there any differences in:
1) Fuel pump(s)
a) Are there always dual pumps (pre-pump) in 300+ HP systems?
2) Fuel accumulator
3) Fuel filter
4) System pressure regulator and topping valve
5) WUR
6) Airflow meter
7) Sensor plate
8) Throttle body and butterfly
9) Fuel distributor
10) Outlet nipples
11) Injectors
12) Intake runners
It would be great if we could get this answered in a single short thread. Especially for guys like me who are putting an m28.22 into a 1978 ROW car
Thanks,
Fronkensteen
#2
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US CIS was only 78 & 79
ROW CIS was 78 to 83
US & ROW 4.5L 78, 79, 80, 81 & 82 practically the same
ROW 4.7L 80 to 83 - different cams, heads and spider - made the difference in HP
M28/22 was never a CIS engine it is LH-Jetronic 84 to 86 16v - lots of differences and more akin to a 85/86 S3 32v car
ROW CIS was 78 to 83
US & ROW 4.5L 78, 79, 80, 81 & 82 practically the same
ROW 4.7L 80 to 83 - different cams, heads and spider - made the difference in HP
M28/22 was never a CIS engine it is LH-Jetronic 84 to 86 16v - lots of differences and more akin to a 85/86 S3 32v car
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
#4
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Top end - M28/11-12 spiders or convert the M22 spiders to take the CIS injectors.
My head hurts just thinking about what needs changing.
A M28/11-12 would be a much easier swap IMHO.
My head hurts just thinking about what needs changing.
A M28/11-12 would be a much easier swap IMHO.
#6
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I guess I am just going to megasquirt the darn thing
#7
Burning Brakes
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Fronkensteen
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#8
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I know for sure that the throttle body, intake runners, and spider body are different and I think they have to be used as a matched set (i.e. you cannot connect euro S runners to a US spider body) I'm also pretty sure the WUR is a little different, at least as far as settings. I'm pretty sure the fuel lines, pumps, injectors, fuel dist can be mixed and matched. I think the dual pump thing is an attempt to make sure the car does not get vapor lock, which it does not anyway. Other, prior, Porsche models do, though, so I think they just wanted to make sure. If you are worried about sufficient fuel delivery there is a test for that in the WSM and if you meet the test spec you should be fine. If your short term mission is just to get a car that is running and on the road you can put either complete system on either motor.
#9
Burning Brakes
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Karl,
Thanks for the info. My intention is to go Mega eventually once Allan makes me some brackets and such. Until then I would like to run the can without leaning it out and losing a cylinder. I guess my AFR Guage will help me keep it from burning down.
Fronkensteen
Thanks for the info. My intention is to go Mega eventually once Allan makes me some brackets and such. Until then I would like to run the can without leaning it out and losing a cylinder. I guess my AFR Guage will help me keep it from burning down.
Fronkensteen
#10
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So here is my interim fuel delivery solution for Inga until I can get all my MS3PRO stuff lined up :
Attachment 851246
So use your imagination. The great thing is that dimensionally the K vs LH injectors are very similar most importantly the diameter is equal. The mounting perches for the LH injectors make a very convenient place to hang a mounting rail. Using basic machine tools and some aluminum bar stock we'll be in business next week!
Oh and the WOT flow of the metering plate is plenty adequate to support the 90mm TB. The issue will be fuel flow but then again I'm not looking to hammer on her before she gets the MS3PRO. Just want to thresh out any chaff in the mechanicals.
Comments?
Fronkensteen
Attachment 851246
So use your imagination. The great thing is that dimensionally the K vs LH injectors are very similar most importantly the diameter is equal. The mounting perches for the LH injectors make a very convenient place to hang a mounting rail. Using basic machine tools and some aluminum bar stock we'll be in business next week!
Oh and the WOT flow of the metering plate is plenty adequate to support the 90mm TB. The issue will be fuel flow but then again I'm not looking to hammer on her before she gets the MS3PRO. Just want to thresh out any chaff in the mechanicals.
Comments?
Fronkensteen
#13
Burning Brakes
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Not enough info to understand your point. Converting the 78 RoW to LH-Jetronic was NEVER an option. To much hassle for no real gain other than to say it is "Porsche" and it is still wrong for that year car. If we're going for EFI in a 78 we're going mega.
However, if you will notice this is CIS and it is Porsche and it is bolt on. Better still it looks like it belonged there from day one to the casual eye.
Fronkensteen
However, if you will notice this is CIS and it is Porsche and it is bolt on. Better still it looks like it belonged there from day one to the casual eye.
Fronkensteen
#14
I have an M28/22 (Euro S2 LH-Jet 310hp) motor in my Euro 79 using the original CIS system. From memory it needed an "S" M28/11 spider, plenum and throttle body. Used original dizzy. Makes good power and torque (320hp with S3 manifolds and 3" exhaust). The M28/22 is a great motor.