Guest seriour Posted January 11, 2006 Share Posted January 11, 2006 does it bolt on? will it give lover compression?? and will it work with twin 40mm sidedrafts. im recoing my 4g32 but i can get either a 4g32 head or a 4g37 one. i heard there is a head you can put on to lower compression??????? Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted January 11, 2006 Share Posted January 11, 2006 does it bolt on? will it give lover compression?? and will it work with twin 40mm sidedrafts. im recoing my 4g32 but i can get either a 4g32 head or a 4g37 one. i heard there is a head you can put on to lower compression??????? lower compression.. why would you wanna dude? you're clearly goin n/a with the sidedrafts. you'll be wanting high comp, max flow to make the most of them! Quote Link to comment Share on other sites More sharing options...
Guest redseven Posted January 12, 2006 Share Posted January 12, 2006 What sort of car do you have? Quote Link to comment Share on other sites More sharing options...
fuel Posted January 13, 2006 Share Posted January 13, 2006 It lowers it serious low - like from 9:1 down to 7:1 - you definitely don't want that! The 4G37 head has bigger valves and probably ports too, but you can easily work your 4G32 head to have the same ports and valves. Quote Link to comment Share on other sites More sharing options...
TygerTung Posted January 13, 2006 Share Posted January 13, 2006 Gives you low as compression, I had a 1600 turbo 4G62, and put a 4G37 head on and the compression was too low, i even had 10 thou taken off it, I had to have the dizzy spun around as much as it could go. Quote Link to comment Share on other sites More sharing options...
Guest seriour Posted January 21, 2006 Share Posted January 21, 2006 yea sorry i was told it gave higher compression. is there a head that will bold onto a 4g32 that will make it higher compression Quote Link to comment Share on other sites More sharing options...
fuel Posted January 21, 2006 Share Posted January 21, 2006 Yes, a shaved 4G32 head. Don't bother with any other 4G3 series head, as they will be smaller capacity (bar the 4G37), and have smaller valves etc. All the smaller ones were chain driven anyway. Quote Link to comment Share on other sites More sharing options...
topps Posted May 18, 2010 Share Posted May 18, 2010 *bump* how about a 4g32 head sitting on a 4g37 block? will the piston hit the valves? im running on a 4g37 but i have damaged the 4g37 head so i want to use my spare 4g32 head. im not sure if the pistons will hit the valves or will have hi or low compression. what i have done so far is fit in the 4g32 head(without the valves) to the 4g37 block and rotate the crank pulley. so far no problem. but im not sure if i try it again with the valves on. Hoping it would not be hitting each other. Thanks! Quote Link to comment Share on other sites More sharing options...
Ogre Posted May 18, 2010 Share Posted May 18, 2010 is the 4g32 the chain driven or belt driven? Quote Link to comment Share on other sites More sharing options...
topps Posted May 18, 2010 Share Posted May 18, 2010 both are belt driven sir. Quote Link to comment Share on other sites More sharing options...
fuel Posted May 18, 2010 Share Posted May 18, 2010 the issue is that the 4G32 has a smaller combustion chamber size (as well as smaller diameter valves, smaller port sizes) and the pistons are flat-top (usually) while the 4G37 has a large combustion chamber and dome-top pistons. Given that a 4G37 head on a 4G32 massively lowers the CR from say 9:1 to 6-7:1 I would say even if the pistons and valves didn't make contact the CR would increase from 9:1 to beyond 11:1. Quote Link to comment Share on other sites More sharing options...
topps Posted May 18, 2010 Share Posted May 18, 2010 thanks sir fuel. what setbacks should i expect given that higher CR? pros and cons? Quote Link to comment Share on other sites More sharing options...
fuel Posted May 18, 2010 Share Posted May 18, 2010 detonation for starters, you would have to run a very wild cam to make the most of that CR. But the main issue at hand here is that the 4G32 valves and ports will be smaller - what's wrong with just finding another 4G37 head? they are easy to find, they were in Sigmas, Galants, Chariots, Tredias, Cordias etc. Quote Link to comment Share on other sites More sharing options...
Ogre Posted May 18, 2010 Share Posted May 18, 2010 get a 4g63...seriously Quote Link to comment Share on other sites More sharing options...
topps Posted May 18, 2010 Share Posted May 18, 2010 well its an issue here in PI. 4g37 are not common here. we only have 4g33,4g32 and 4g63 that came in lancers and galants 78-87. well im not into too much performance, and tends to have it used as a daily driver with enough power when needed. would you suggest a go signal for this? 4g63 is another option, probably after marriage. LOL. Quote Link to comment Share on other sites More sharing options...
Ogre Posted May 18, 2010 Share Posted May 18, 2010 4g63 will make it alot nicer to drive, way torque at standard than 4g37 Quote Link to comment Share on other sites More sharing options...
fuel Posted May 18, 2010 Share Posted May 18, 2010 while the 4G63 will drop in the 4G37's place it will also make more power/torque and has the scope to produce more power as well - I have a soft spot for the old 4G37 but not many people modify them because their design just doesn't really like to rev, the rods and crank are far heavier than what they need to be and the factory cam is very conservative with its duration and lift. also where is 'PI'? Quote Link to comment Share on other sites More sharing options...
topps Posted May 18, 2010 Share Posted May 18, 2010 so 4g63 is the way to go. can i still do this 4g32 head to 4g37 rebuild while saving up for a future 4g63 upgrade? you are exactly correct with the rev issue of 4g37s. Quote Link to comment Share on other sites More sharing options...
fuel Posted May 18, 2010 Share Posted May 18, 2010 with a 4G32 head just slapped onto a 4G37 block untouched you're going to run into massive drivability issues - that is assuming the head combustion chamber and valves don't occupy the space of the piston domes when at TDC. On my old 4G37 when it blew a head gasket I had the head reconditioned which was skimmed a little bit in the process. Before the head gasket blew I had 185psi even across all four cylinders with the standard 9.5:1 CR and with the head skimmed (am unsure how much they took off, it was a minimal amount anyway) the compression figures were well above 200psi on all cylinders with one peaking at 225psi, so I would only assume the CR was raised to close to 10:1 or perhaps slightly above, and even then I had issues with the engine pinking through the rev range and I had to retard the ignition timing slightly and run on the highest octane fuel we had here. What car is this 4G37 in? Quote Link to comment Share on other sites More sharing options...
topps Posted May 18, 2010 Share Posted May 18, 2010 well it sits on my 1987 lancer. the lancer originally should have 4g32/33 but it has the 4g37 when i bought it. *weird* the head combustion chamber of the g32 is slightly smaller than the 37 but do not have the kidney shape... i have yet to test if the valves will not hit the piston but will do one of this days. Quote Link to comment Share on other sites More sharing options...
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