 75 2.0 engine vs. 74 2.0 engine, Can you go back in time? |
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| Panamericana |
 Apr 29 2009, 08:42 PM
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#1
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Newbie  Group: Members Posts: 12 Joined: 29-March 09 From: Toronto Member No.: 10,216 Region Association: Canada  |
I am looking at a 74 that had its 1.8 engine switched-out for a 75 2.0 engine. How big of a task is it to backdate a 75 2.0 engine so that it performs and has the characteristics of a 74 2.0? Would the extra 7 hp that might be gained even be noticeable?
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| JRust |
Apr 29 2009, 08:57 PM
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#2
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914 Guru Group: Members Posts: 6,307 Joined: 10-January 03 From: Corvallis Oregon Member No.: 129 Region Association: Pacific Northwest 
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If it still has all the smog take it all off. Block of the ports on the motor. Pretty easy & worth the time. I'm not sure that gets the 7hp you mention but is probably close depending on your muffler & Exhaust. The 75 HE do not flow that well. Your definately better off with early 2.0 Heat Exchangers. Good luck
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| SLITS |
Apr 29 2009, 10:13 PM
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#3
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
They are the same except for:
1.) Restrictive exhaust 2.) Lack of head vents (which can be added) 3.) Addition of air injection holes into the exhaust ports (which can be plugged) 4.) Lack of tapped screw holes to secure the engine tin (screw holes would be where the air injection holes are. Same crank, same pistons, same heads. The exhaust probably accounts for the greatest loss in HP. |
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| SirAndy |
Apr 29 2009, 10:18 PM
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#4
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Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Panamericana @ Apr 29 2009, 07:42 PM)  Would the extra 7 hp that might be gained even be noticeable? That's almost 10% power gain! (7.95 to be exact) Yes, you'll be able to feel that. (IMG:style_emoticons/default/popcorn[1].gif) Andy PS: And if you upgrade to Euro Spec while you're in there you'll get a 13.63% power increase. Make that a 2056 with a modded Cam and now you're getting close to 30% power gain. |
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| r_towle |
Apr 30 2009, 05:54 AM
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#5
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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I agree with everything above.
I want to stress, get RID of the 75 HE setup. It not only is a lower power system, it is also a heat issue. The 75 setup routes the tubing forwards and then back, thus there is more heat under the head for alot longer....motors run hotter. Its also a total bitch to do valve adjustments or anything else with that system up in there. Rich |
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| 914Sixer |
Apr 30 2009, 06:51 AM
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#6
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Acording to spec book. 75 had 88 hp and the 74 had 95 hp.
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| computers4kids |
Apr 30 2009, 07:41 AM
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#7
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Love these little cars! Group: Members Posts: 2,443 Joined: 11-June 05 From: Port Townsend, WA Member No.: 4,253 Region Association: None |
QUOTE(SirAndy @ Apr 29 2009, 09:18 PM) QUOTE(Panamericana @ Apr 29 2009, 07:42 PM) Would the extra 7 hp that might be gained even be noticeable? That's almost 10% power gain! (7.95 to be exact) Yes, you'll be able to feel that. (IMG:style_emoticons/default/popcorn[1].gif) Andy PS: And if you upgrade to Euro Spec while you're in there you'll get a 13.63% power increase. Make that a 2056 with a modded Cam and now you're getting close to 30% power gain. And, if you drop in a SBC that will be a 300% gain...kind of. (IMG:style_emoticons/default/piratenanner.gif) And yes, you can "feel that" |
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| Panamericana |
Apr 30 2009, 09:13 PM
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#8
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Newbie Group: Members Posts: 12 Joined: 29-March 09 From: Toronto Member No.: 10,216 Region Association: Canada |
QUOTE(r_towle @ Apr 30 2009, 07:54 AM) I agree with everything above. I want to stress, get RID of the 75 HE setup. It not only is a lower power system, it is also a heat issue. The 75 setup routes the tubing forwards and then back, thus there is more heat under the head for alot longer....motors run hotter. Its also a total bitch to do valve adjustments or anything else with that system up in there. Rich Thanks everyone -- that's really useful info. |
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| Sleepin |
Apr 30 2009, 10:14 PM
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#9
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Advanced Member Group: Members Posts: 3,647 Joined: 20-November 07 From: Grand Junction, Co. Member No.: 8,357 Region Association: Rocky Mountains |
QUOTE(computers4kids @ Apr 30 2009, 07:41 AM) And, if you drop in a SBC that will be a 300% gain...kind of. (IMG:style_emoticons/default/piratenanner.gif) And yes, you can "feel that" (IMG:style_emoticons/default/drooley.gif) (IMG:style_emoticons/default/flag.gif) WooHooo!!!! |
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