 2.0l Heads with 48/38- too big for a 2258? |
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| tornik550 |
 Aug 15 2011, 02:41 PM
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#1
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
My buddy has a set of 2.0l heads that have 48mm intakes and 38mm exhaust valves. I am using weber 44idf's, My cam has .500" lift.
I intend on using my car for street and auto x. Is this a reasonable set of heads for my setup or should I go smaller? |
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| HAM Inc |
Aug 16 2011, 07:04 AM
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
If the heads have been welded so the intake ports can be enlarged enough to support the full potential of a 48mm valve, and you have the right cam and exhaust with more induction than was listed and want to turn some revs, then the large valves will work okay. Otherwise you will not have as much engine as if you ran the HAM/RAT LE-200/V4.0 heads with 44x 36mm valves along with the appropriate cam, exhaust, and induction.
[quote]You could buy them and make a turbo T4...[/quote] Controlling those giant (heavy) intake valves under boost would be a challenge at any boost levels/rpm's worthwhile for such big valves. quote]Velocity would not be a problem then...[/quote] N.A. or Forced Induction, velocity is always important. [quote]Oh wait, I forgot... You can't turbo a T4 [/quote] Any engine can be turbocharged. My professional opinion is that the T4 is not a good candidate for it, at least not with any bore over 91mm. The heads don't have the strength for it. |
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| r_towle |
Aug 16 2011, 11:21 AM
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#3
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Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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QUOTE(HAM Inc @ Aug 16 2011, 09:04 AM)  If the heads have been welded so the intake ports can be enlarged enough to support the full potential of a 48mm valve, and you have the right cam and exhaust with more induction than was listed and want to turn some revs, then the large valves will work okay. True, and lots of fun. Rich |
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Posts in this topic
tornik550 2.0l Heads with 48/38- too big for a 2258? Aug 15 2011, 02:41 PM
yeahmag Those are HUGE. I'd post over in Jake's fo... Aug 15 2011, 03:23 PM Jake Raby That big intake valve just gets in the way of true... Aug 15 2011, 06:02 PM
tornik550
That big intake valve just gets in the way of tru... Aug 15 2011, 06:14 PM Jake Raby Bigger isn't better. Aug 15 2011, 06:19 PM r_towle only fun at WOT.
The rest of the time it will just... Aug 15 2011, 07:11 PM Jake Raby And it won't even make power at WOT.
Bite the... Aug 15 2011, 07:41 PM kg6dxn You could buy them and make a turbo T4... Velocity... Aug 15 2011, 11:14 PM Jake Raby Just like Len said.. The port can't support th... Aug 16 2011, 11:08 AM |
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