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Guest Message by DevFuse
 

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Differance between cams on EA82 turbo and carb motors


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7 replies to this topic

#1 Mike Moore

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Posted 13 August 2006 - 10:08 AM

Is there a differance between the cans on the turbo motor and the carb motor on EA82. If there is would the turbo cams work Better on my EA82 then stock. I have the carb motor in mine
Thanks
Mike

#2 mikeshoup

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Posted 13 August 2006 - 10:11 AM

Yes, there is a difference, and no, the turbo cams probably wouldn't work better on your carb motor.

#3 Mike Moore

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Posted 13 August 2006 - 10:20 AM

ok what is the differance. just trying to make it breath better

#4 calebz

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Posted 13 August 2006 - 11:00 AM

Actually, It depends on the year.. This is something I came across quite a while ago, someone with an 85-86 FSM will have to verify.

85-86 Carb and turbo used the same cams.
87+ they are different with the turbo cams allowing for less valve overlap

#5 Mike Moore

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Posted 13 August 2006 - 11:12 AM

The turbo motor came out and 86 and don't know year on mine it's a used jap motor. I live at high altatude. just looking for a way to get more air. Was hoping the turbo cam had longer duration than stock carb cam.

#6 NorthWet

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Posted 13 August 2006 - 11:32 AM

Not quite what was asked... this is from the 1989 FSM that is on "Finleyweb", section 2-3 pg 6:

SPFI:
Intake (open/close): 10BTDC/54ABDC (Duration: 244)
Exhaust (open/close): 49BBDC/15ATDC (Duration: 244)
(Overlap: 25degrees)

MPFI Turbo:
Intake (open/close): 14BTDC/56ABDC (Duration: 250)
Exhaust (open/close): 56BBDC/14ATDC (Duration: 250)
(Overlap: 28degrees)

(Duration and overlap were computed by me, so may be subject to math error.)

I thought that I had heard that the SPFI cams were "wilder" than the turbo cams, but it doesn't look this way for this year. I am interested in finding out what the mildest cam for the EA82 series is.

#7 mikeshoup

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Posted 13 August 2006 - 03:57 PM

From the 86 FSM:

Carb
Intake (open/close): 3 BTDC / 51 ABDC
Exhaust: 47 BBDC / 7 ATDC

SPFI
Intake: 10 BTDC / 54 ABDC
Exhaust: 49 BBDEC / 15 ATDC

MPFI non-Turbo
Intake: 12 BTDC / 58 ABDC
Exhaust: 58 BBDC / 12 ATDC

MPFI Turbo
Intake: 3 BTDC / 51 ABDC
Exhaust: 47 BBDC / 7 ATDC

Appears in 86 Carb and Turbo are the same, but the rest are different. I dunno what any of this means though. Someone else can do the calculations needed.

#8 bgd73

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Posted 13 August 2006 - 05:40 PM

From the 86 FSM:

Carb
Intake (open/close): 3 BTDC / 51 ABDC
Exhaust: 47 BBDC / 7 ATDC

SPFI
Intake: 10 BTDC / 54 ABDC
Exhaust: 49 BBDEC / 15 ATDC

MPFI non-Turbo
Intake: 12 BTDC / 58 ABDC
Exhaust: 58 BBDC / 12 ATDC

MPFI Turbo
Intake: 3 BTDC / 51 ABDC
Exhaust: 47 BBDC / 7 ATDC

Appears in 86 Carb and Turbo are the same, but the rest are different. I dunno what any of this means though. Someone else can do the calculations needed.


Of course all this is time related factors, but I found zero difference physically with 1989 sube book for physical height (lift) and duration. good info, never knew they were physically different....




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