Belowu

Anybody actually know how much bigger the 20B is compared to the 13B motor in actual size or dimensions? I am trying to fit 1 of these in a different make of vehicle and am wondering about the actual size. Is there a big size difference between the 2? Anybody know the difference front to back and the difference side to side on these? Somebody please help here. Thanks.

Newb

RX-Heven

iTrader: (1)

It is 6-5/16" longer. The engine itself without manifolds is the exact same dimensions width and height wise.

Jeff20B

iTrader: (13)

Exactly 160mm longer than a 13B. About 13" wide, not counting manifolds. About 13 or 14" tall. The top of the manifold is 9" above the top of the engine. The oil pan is several inches deep. Overall length is about 666mm long.

Belowu

Wow, not too much difference. Not even 6 1/2" and the same size width and height wise? That doesn't sound too bad. I was thinking it would be bigger all around. Might have to go for the 20B in my Toyota 4Runner... Any drawbacks in using a 20B over a 13B? Thanks guys.

Newb

Jeff20B

iTrader: (13)

The length and weight. The bare sandwich isn't much heavier than a 13B. It's the stock twins that add around 68LBS to the side of the engine. I could feel a difference on my engine crane with a full 20B compared to after it was stripped down to the bare uh block.

As for the stripped down 20B, all you have are one more rotor housing, S5 rotor, 16cm length of E shaft with on rotor journal, 16cm worth of about 18 tension bolts, and lastly the 80mm wide 20B-only intermediate plate which houses a stationary gear. I don't know its weight (it's hollow inside, but it's still probably as heavy or heavier than the other side plates). Oh yeah, the extra intake manifold runners add a little weight too.

johnisenglish

Even bare my 20B seems A LOT heavier then my 13B, though I haven't actually weighed it. However, the exact weight difference has been listed on the forum before (I think its in the 75lb - 100lb area), and its really not that big a deal

Jeff20B

iTrader: (13)

I installed an engine that was built with an REPU in mind into a project care. It's got the REPU's 9 bolt 33LBS flywheel, cast iron waterpump, 11+LBS rotors, stock Hitachi carb (with its iron base plate), R5 side plates, stock GSL-SE (or whatever) cast iron exhuast manifold etc. This 13B is a lot heavier than a S5 13B, so it's sort of an accurate test in this case because there is also a group size 24 battery (yeah, it's fairly large) way up in the front corner of the engine behind the headlight.

j9fd3s and I were talking about it, and it's possible my stripped 20B will break-even as far as weight over the front wheels is concerned when compared with the REPU-ish 13B that's in it right now. There'll be no battery up front, FC aluminum waterpump, light carb (for now), tubular header which, for its size is around the same weight as the cast iron manifold, yet is spread further rearward, as well as about 1/3 of the engine.

The car may gain a little weight overall (battery moving to the back and all that), but the front end ought to be just about the same as it is right now. Infact, when the 20B was in it for test fitting purposes, it seemed a little lighter (higher off the ground) than it does with the 13B in it. Ywah, I need some aftermarket springs as the stockers are a bit soft.

John, I once weighed a few parts and came up with the 70-75lbs theory. It'd be nice to actually be able to weigh the entire engine though.

johnisenglish

I'll try to weigh them both on a scale once I've got my 13brew out again

Jeff20B

iTrader: (13)

That would be very cool. I'll try to find out how much the special 20B-only intermediate plate weighs.

johnisenglish

yeah, I'll make sure to weight the intermediate plates and E-shaft weigh while I have the engine part in about a month

I413rxendan

Is that 666mm length from trans mounting surface to accessory drive pulleys? I want to put one in an MR2. Did anyone ever get the chance to weigh a complete 20B with manifolds and accessories?