(goldfish) Posted May 10, 2004 Share Posted May 10, 2004 Ok, so the rb26det has much more power potental than the l28et, but why? You can upgrade the internals of the l28et to handle the power. Is there a magical rod-stroke-bore combo we just can't achive with the l28? Or do the haeds just suck that bad? Still tring to learn more about these things. Thanks Quote Link to comment Share on other sites More sharing options...
Tony D Posted May 10, 2004 Share Posted May 10, 2004 Beat to death, but to summarize: the head bolt clamping pattern on an RB engine is far better than the setup on an L28. They hold the pressure in better, without the head lifting. The L28 does not have optimal headbolt placement, the RB is far better in that respect. Anything else is just superficial. The L28 should easily support 800HP on the non-crossflow head, and if you could pick up an LY, probably another 100HP. Then the heads start stretching the headbolts and lifting... Quote Link to comment Share on other sites More sharing options...
stony Posted May 10, 2004 Share Posted May 10, 2004 800 HP on an L? Thats one expensive L motor. Not sure i have ever heard of or seen a L motor with that kind of power. Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted May 10, 2004 Share Posted May 10, 2004 Beat to death' date=' but to summarize:the head bolt clamping pattern on an RB engine is far better than the setup on an L28. They hold the pressure in better, without the head lifting. The L28 does not have optimal headbolt placement, the RB is far better in that respect. [/quote'] JoelS just purchased a torque plate for his RB26 and he said the holes exactly match the L28 So, he was able to place the L28 head gasket onto the RB26 block:roll: I will ask him again to verify this Quote Link to comment Share on other sites More sharing options...
Guest 81na ZX Posted May 11, 2004 Share Posted May 11, 2004 Quick summary: L28: SOHC single sided head Bore 86mm Stroke 79mm RB26: DOHC cross flow Bore 86mm Stroke 73.7mm Quote Link to comment Share on other sites More sharing options...
(goldfish) Posted May 12, 2004 Author Share Posted May 12, 2004 It just seemed unlikely that you could get about double the hp by having a different head desgin. I've heard that the l28 heads aren't that great but wow. And it does sound like the bolt & cylinder holes line up on the two engines. (still reading the archives ) Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted May 12, 2004 Share Posted May 12, 2004 Yes, it is a FACT. The headbolts are in the exact same location on the RB26 as the L6. I bought a torque plate for my RB26 build, and the bolt holes line up exactly, the bores are also located the same. The only differnce is the headbolt dia. size Quote Link to comment Share on other sites More sharing options...
Guest 81na ZX Posted May 12, 2004 Share Posted May 12, 2004 The only differnce is the headbolt dia. size Which is also a difference between the RB20&25 vs. the 26 Quote Link to comment Share on other sites More sharing options...
MrWOT Posted May 12, 2004 Share Posted May 12, 2004 triple post Quote Link to comment Share on other sites More sharing options...
MrWOT Posted May 12, 2004 Share Posted May 12, 2004 double post Quote Link to comment Share on other sites More sharing options...
MrWOT Posted May 12, 2004 Share Posted May 12, 2004 So you're telling me the bolt pattern is the same?! What about the bore spacing? Search isn't working or I'd check, but it sounds like with drilling and tapping the head can be made to fit? If the oiling and water passages line up you could always drill and tap for external oiling and cooling. hmmmmm..... Quote Link to comment Share on other sites More sharing options...
Aurae10 Posted May 12, 2004 Share Posted May 12, 2004 Not to change the topic a little, but what are the differences in weight between the L28 and the RB26? Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted May 12, 2004 Share Posted May 12, 2004 the L28 has aluminum block/head' date=' which is lighter, but not as strong as iron under high boost. [/quote'] You've got to be kidding... right?.... The bolt pattern/ bore spacing may be the same, but thats the only thing in common. The L6 headgasket set on top of a RB block will show you what I mean... Virtully no water/ oil passages line up, so forget about putting a RB head on a L6 block... Quote Link to comment Share on other sites More sharing options...
MrWOT Posted May 13, 2004 Share Posted May 13, 2004 You've got to be kidding... right?.... The bolt pattern/ bore spacing may be the same, but thats the only thing in common. The L6 headgasket set on top of a RB block will show you what I mean... Virtully no water/ oil passages line up, so forget about putting a RB head on a L6 block... So the spacing IS the same! It can be done then, but the head will have to be drilled and tapped for external provisions. In the best case you need to make a 'water manifold' for each side of the head so you feed it evenly and have more even tamps, I'd recommend feeding from the exhaust side as it will help with more even temps. It can be done, and HAS been done with other engines/heads. I'm amazed with all the knowledge here that noone has done it to the L block... Take the Ford 2.3L lima block. The guys over at turboford.org took a volvo 16v head that ONLY has the bolt pattern right, bore spacing is a little off and oil/water holes DON'T match, and a couple of them did it anyway by tapping the head and using external oil feed from a tee after the filter. If they can do it, so can we! all you need to figure out is how to fit a belt to the contraption. OF course, I'M certainly not going to be the first to try it Oh yeah, you can see how the ford one was done here --> http://www.4bangerturbo.com/volvodohc.htm should give you an idea of whats involved. I imagine at least SOME of the coolant/oil holes match up, but as I don't have the heads, I can't be sure... Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted May 13, 2004 Share Posted May 13, 2004 the L28 has aluminum block/head' date=' which is lighter, but not as strong as iron under high boost. [/quote'] You've got to be kidding... right?.... BTW, I was just pokein fun at the L6 alum block/head statement.... (No insult ment) Quote Link to comment Share on other sites More sharing options...
Drax240z Posted May 13, 2004 Share Posted May 13, 2004 the L28 has aluminum block/head' date=' which is lighter, but not as strong as iron under high boost. [/quote'] You've got to be kidding... right?.... BTW, I was just pokein fun at the L6 alum block/head statement.... (No insult ment) No worries poking fun, but lets be a little more certain about our facts before we go giving someone advice with facts that are way off... This is the type of statement I'd expect on many other bulitin boards, but not here! 8) Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted May 13, 2004 Share Posted May 13, 2004 the L28 has aluminum block/head' date=' which is lighter, but not as strong as iron under high boost. [/quote'] You've got to be kidding... right?.... BTW, I was just pokein fun at the L6 alum block/head statement.... (No insult ment) No worries poking fun, but lets be a little more certain about our facts before we go giving someone advice with facts that are way off... This is the type of statement I'd expect on many other bulitin boards, but not here! 8) (scratching my head) who exactly are you telling to get thier facts strait? Quote Link to comment Share on other sites More sharing options...
wheelman Posted May 13, 2004 Share Posted May 13, 2004 I think he's talking to Vegeta! Kind of throws a new light onto all that was said in the V8 vs inline 4 thread. Wheelman Quote Link to comment Share on other sites More sharing options...
Guest porschephile Posted May 13, 2004 Share Posted May 13, 2004 The rb26 internals are much more durable for making larger amounts of power than an l28et. From what I understand, after about 350-400hp, you really need to use better bearings, head gasket, etc in an l28et. You can normally take stock rb26's to 500+ without opening them up. A metal head gasket is a good idea to do of course, however the internals are good for 600+ hp. There are many people who have pushed past 600hp with stock internals, however how long they last is anyone's guess. Although, Sean Morris as well as some other people have a number of cars pushing past the 600 mark that have lasted a long time so who knows. Either way, it isn't just the 26's head but the whole engine itself is built stronger and more durable. Quote Link to comment Share on other sites More sharing options...
Guest cs14silvia Posted May 13, 2004 Share Posted May 13, 2004 any one done RB20/25/26 conversion to their 280z? I am seeking for this kinda info Quote Link to comment Share on other sites More sharing options...
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