differences in big port and small port oem cams
06-25-2010, 02:51 AM
Post: #1
differences in big port and small port oem cams
just wondering is the duration and lift the same on both these engines?
Find all posts by this user
06-25-2010, 08:52 AM
Post: #2
differences in big port and small port oem cams
According to Club4AG, the big port cams are said to have a tiny bit more
lift (7.56 vs 7.1) and a fraction more duration (240 x 232). However, even
though this swap is often recommended, I have never seen a post with
figures to prove that there is any measurable gain.

Where are the "Mythbusters" when you need them Smile

Cheers... jondee86
Find all posts by this user
06-25-2010, 11:02 AM
Post: #3
differences in big port and small port oem cams
Hi there , I tried this swap and dynoed the car before and after with no other changes ,(smallport) and there was no noticeable gains to be had , so swapped back to the originals .The figures may be different between the two types of camshaft but maybe the head differences prevent any gain ?

Your addiction to motorsport can only be cured by poverty !!
Find all posts by this user
06-25-2010, 12:12 PM
Post: #4
differences in big port and small port oem cams
nzae86 Wrote:The figures may be different between the two types of camshaft but maybe
the head differences prevent any gain ?

Quite likely. Toyota will have optimised the cams for each engine. They
would have tested many different profiles before they settled on the the
one that best met their goals for the engine.

Meeting emission standards, and having an engine that worked well with
an auto trans, would have almost certainly been part of the design brief
for the smallport. Because, having lost the "sporty" RWD platform, there
was no longer any need for a "sporty" free-revving engine when the
smallport was being developed.

So yeah, hardly surprising that there is no gain when swapping cams. Bit
like when I put GZE cam covers on my smallport... Tongue

Cheers... jondee86
Find all posts by this user
06-25-2010, 01:36 PM
Post: #5
differences in big port and small port oem cams
I had bigport cams in my car, I havent't dynoed it, so I can't say any results, only my butt dyno showed something Smile But I can confirm the information from the club4ag, we have measured the cams and we found the same differences.
Find all posts by this user
07-03-2010, 01:52 PM
Post: #6
differences in big port and small port oem cams
I have heard reports of 3kw, I can't personally verify it though
Find all posts by this user


Possibly Related Threads...
Thread Author Replies Views Last Post
  Big wheel problems gh0st 16 8,126 11-15-2021 10:51 PM
Last Post: gh0st
  Clutch differences LUK vs Exedy r.ave 2 5,043 05-27-2021 09:30 AM
Last Post: r.ave
  4AGE block differences explained (incl. some eyecandy) Bean 46 86,959 05-05-2019 04:03 AM
Last Post: Rocker100
  Early tvis red top from e9 gti small or bigport? Ryo 3 7,471 04-20-2018 09:14 AM
Last Post: Ivan141
  Shim size for AM cams kazi 4 5,153 12-18-2017 05:34 PM
Last Post: oldeskewltoy

Forum Jump:


User(s) browsing this thread: 4 Guest(s)

Contact Us | AEU86 | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication