Ported 2JZ / Ported 1FZ comparison

[oldeskewltoy]

I thought about doing that, especially as the big port heads have a noticeable angle/bias in them. That is, #1 port bias toward the front of the engine (from the flange to the valves) . #2 toward the middle

yep...... also there is a company who is making "offset" cams - Tri-flow is the trademarked name. One lobe of a pair of the cam is slightly shorter duration (261/268 - I think). The problem with these cams is no one gave thought to which valve would better benefit from it... so the offset lobes do NOT match the offset ports

[andrew_mx83]

couple of great links there guys, thanks

the bloke who does my head machining wants to port one for me too, he wants to take the 7m head & weld up the bottom of the intake ports & reshape them to be closer to vertical. he wants over 2grand for the porting, i knew it would be better than just cleaning/openning up the ports that i had planned to do but did not realise there was anytthing in the order of 20% more flow to be gained.
maybe it will be money well spent down the track.

will read the article on different valve sizing when i have a spare hour or 2

[Duk]

Without wanting to drag this thread any further off topic than I have ,
I have seen a couple of steep angled inlet ports who's engines have gone on to produce very respectable power in both standard and modified forms. The Nissan FJ20 (16 valve) is 1 example and the Alfa Romeo Twin Spark(plug, 8 valve) used in the Alfa 75's (not the earlier factory race engine twin spark plug engines) is another.

[andrew_mx83]

two very good motors in their own right... cheers


back on topic..... nice numbers from the 1fz head! sounds like it will be a real monster

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Hi MS-75
I realize this is an old thread, but for some reason I can't see the pictures. Could you repost or pm me the flow data for 1FZ vs 2JZ heads?
Thanks