Hi-Comp Pistons: 124 Spider

spiderrey · Post by **spiderrey** » Tue Sep 05, 2006 7:29 pm

its a common swap from what ive been told and heard.

lanciahf · Post by **lanciahf** » Tue Sep 05, 2006 9:03 pm

1800 heads yes and no. Yes the 1800 heads will raise compression about 1/2 a point but they flow less than the 2L heads. Unless you need a head I would leave it and wait for a piston upgrade.

Mark_vaughn · Post by **Mark_vaughn** » Wed Sep 06, 2006 8:36 am

Can you put a 2L head on an 1800 block with hi-comp pistons and get the better flow?

So Cal Mark · Post by **So Cal Mark** » Wed Sep 06, 2006 10:30 am

I'd like to see flow figures for stock 1.8 and 2L heads. IMHO, I think this is an urban legend about a 2L head flowing better.

spiderrey · Post by **spiderrey** » Wed Sep 06, 2006 5:51 pm

lanciahf, just curious. how did u come to the conclusion that the 2l flows better. ive been told, by people that have more experience with this then me that the 2 liter actually flows not as well as the 1800. and while talking to croft about what i was doing and what i wanted him to do with this head, he never threw up any red flags. does anyone have any real specs on this. or are we all working off hearsay.
thanx reyy

lanciahf · Post by **lanciahf** » Wed Sep 06, 2006 6:20 pm

Sorry all I have to offer is what I read on turbo124.com & Mira. So I guess its hearsay as well.

Like Guy says show me the dyno numbers

So Cal Mark · Post by **So Cal Mark** » Wed Sep 06, 2006 7:22 pm

I just don't see a reason for less flow on a 2l, similar ports and shape. I'll agree that the cc is different

spiderrey · Post by **spiderrey** » Wed Sep 06, 2006 9:48 pm

turbo 124 and mira are good sources.

Wayne Mausbach · Post by **Wayne Mausbach** » Thu Sep 07, 2006 12:29 am

According to the Croft book the 2 liter has bigger ports than the 1800. The only other one is the 1608 which has the same size ports but with a more shrouding of valves. I understand the trick set up is welded up 1608 head has it has bigger ports and higher compression than the 1800. However have not seen any real dyno numbers but the specs say it would produce more.
Wayne in Houston

bandit · Post by **bandit** » Thu Sep 07, 2006 5:27 am

Hi Mighty

If your only running 40 80s just go with the 8.9 pistons your not
giving up much HP maybe a couple at best don't even sweat it !
If you built 2 of these Engines 1 with 9.8 and the other with 8.9
you wouldn't feel a differnce when driving them 1 at a time .

Daniel