evildky
Classic Z Moderator
Offline
6087 posts
71 240ZT, 87 300ZXT, 91 300ZXTT, 93 SE-R
Louisville KY
1-31-2004
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I believe the rb20 mounts will work but you need the crossmsmber to go with it Ibeleive, here is a gey that used the rb25 mounts and made some pretty simple mods to the N/A crossmsmber to accept the rb mounts
http://forums.nicoclub.com/zer...age=1
"if I had all the money I ever spent on cars........I'd spend it all on cars"
12.378 in a rusty datsun with a sliping clutch
"The Rusty Mistress" 299.3 whp and 305 lbft TQ, 2105 lbs
I'm cleaning out my garage, lots fo Z parts, S30, Z31 and Z32 here is my ebay listing
http://motors.search.ebay.com/_W0QQsassZevildky
if you're looking for something shoot me an e-mail, evildky@bellsouth.net
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Racinjitter
Offline
111 posts
1988 300ZX RB25DET
Mount Clemens Mi
4-6-2006
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| « Re: rb25det motor swao into 87 300zx (zman07) | 7:48 PM 5/16/2008 |
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| Quote, originally posted by zman07 » | ok so i got my old motor out and im a little stuck trying to figure out the motor brackets. the only thing that is holding me back. does anyone have any ideas or know if the 240sk motor brackets for an rb conversion would work for my 87 300zx. or does anyone have any blue prints of the engine brackets for this swap?  |
I dont know if you read my swap... But it was really east to make the mounts the way I did them. It was a simple plate with one hole for the engine isolaters. If I were to do it again, I would make the engine brackets, instead of modifying the factory n/a crossmember. It would look a lot cleaner, that is the only reason though. From what I know the only interchange for the rb into a Z31 is the 200zr crossmember, I dont beleive that the 240sx crossmember will work, or the engine isolators. The skyline crossmember will not work in a Z31 also. I had one, I tried but the suspension geometry was completely different.
You may know Me as the guy who swapped a rb25det into his Z31.
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Pharaohabq
Offline
122 posts
92' Nissan 300ZX NA
ABQ NM
4-14-2008
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| « Re: rb25det motor swao into 87 300zx (Racinjitter) | 9:08 AM 5/22/2008 |
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Is the rb25det that much better than a Z31 engine? isn't it smaller and more expensive than building up a Z31 turbo engine?
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mtcookson
Maxima - VG/VE Moderator
Offline
2564 posts
1991 Z32, 1992 Q45, and much much more
Howard KS
11-21-2002
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Just depends on what you want... me personally, I like the VG a lot better. Its inexpensive, strong, easy to modify, relatively cheap to modify, tons of them available, compact, relatively light weight for an iron block V6, already comes stock in the Z31... tons of reasons.The RB25 isn't a bad engine and can definitely make some power but will likely cost you quite a bit more to reach a certain power goal over the VG and your power will be in a higher RPM range compared to the VG. Like I said... just depends on what you want. I saw Jason run his RB25 Z at Branson Z Fest and it moves pretty good and sounds great... should be real fast when he does his other RB engine setup... 
 If you need any large items shipped like engines or even front clips, I can help you out. Just go to AssociatedShippers.com and get a quote.
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AZ-ZBum
Z-Car Guru
Offline
695 posts
84 Z31 NA, 84 Z31 AE, 88 Z31 Vert
Phoenix Arizona
8-4-2003
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| « Re: rb25det motor swao into 87 300zx (Pharaohabq) | 10:24 AM 5/22/2008 |
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| Quote, originally posted by Pharaohabq » | | Is the rb25det that much better than a Z31 engine? isn't it smaller and more expensive than building up a Z31 turbo engine? |
No. Yes.
My site
Z31 Registry
Z32 RegistryI'll try to be nicer if you try to be smarter. 
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zman07
Offline
33 posts
1987 nissan 300zx, soon to be rb25det powered
west warwick ri
5-7-2008
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| « Re: rb25det motor swao into 87 300zx (zman07) | 12:55 PM 5/22/2008 |
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first of all keep your comments to urself. i asked a question and if ur just commenting what im doing ur not helping all i wanted was answers not what u would do. thanks for your imput but no thanks
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evildky
Classic Z Moderator
Offline
6087 posts
71 240ZT, 87 300ZXT, 91 300ZXTT, 93 SE-R
Louisville KY
1-31-2004
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| « Re: rb25det motor swao into 87 300zx (zman07) | 3:40 PM 5/22/2008 |
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| Quote, originally posted by zman07 » | | first of all keep your comments to urself. i asked a question and if ur just commenting what im doing ur not helping all i wanted was answers not what u would do. thanks for your imput but no thanks |
relax, your question was answered in the first few posts, the thread has gone a bit tangent but thats how we learn from one another
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mtcookson
Maxima - VG/VE Moderator
Offline
2564 posts
1991 Z32, 1992 Q45, and much much more
Howard KS
11-21-2002
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| « Re: rb25det motor swao into 87 300zx (zman07) | 3:45 PM 5/22/2008 |
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| Quote, originally posted by zman07 » | | first of all keep your comments to urself. i asked a question and if ur just commenting what im doing ur not helping all i wanted was answers not what u would do. thanks for your imput but no thanks |
My reply was for Pharaohabq's question
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AZ-ZBum
Z-Car Guru
Offline
695 posts
84 Z31 NA, 84 Z31 AE, 88 Z31 Vert
Phoenix Arizona
8-4-2003
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| « Re: rb25det motor swao into 87 300zx (zman07) | 5:25 PM 5/22/2008 |
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| Quote, originally posted by zman07 » | | first of all keep your comments to urself. i asked a question and if ur just commenting what im doing ur not helping all i wanted was answers not what u would do. thanks for your imput but no thanks |
You should download and install Firefox and make your posts using that browser. Then, you would at least appear smart enough to spell. And that may translate to you being smart enough to accomplish this swap.
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evildky
Classic Z Moderator
Offline
6087 posts
71 240ZT, 87 300ZXT, 91 300ZXTT, 93 SE-R
Louisville KY
1-31-2004
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I'm locking this to keep it from spiraling out of control, I don't forsee it going in any positive direction
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