Pearsy47 1 Posted December 20, 2010 Report Share Posted December 20, 2010 Hi i ve got an OBD2 engine but i got a head from my local breakers and slapped it on now i ve take the head back off due to piston rings me thinks ! but my question is ! Is there two different types of valves for the OBD1 and the OBD2 ? can one tell me please thanks steve Link to post Share on other sites
Pearsy47 1 Posted December 20, 2010 Author Report Share Posted December 20, 2010 anyone ??? Link to post Share on other sites
Ben Seabrook 4 Posted December 20, 2010 Report Share Posted December 20, 2010 give peeps time mate !!! as far as I know it's only the manfiolds etc which are different between the two obd's so they should be the same Link to post Share on other sites
bungy 2 Posted December 20, 2010 Report Share Posted December 20, 2010 Link to post Share on other sites
Pearsy47 1 Posted December 20, 2010 Author Report Share Posted December 20, 2010 lol sorry peeps just worries me why there are two types of valves ! as im cleaning them up and finds these sorts of things ! next is the block ! wish me luck i will need it ! Link to post Share on other sites
Dave_ciw 507 Posted December 20, 2010 Report Share Posted December 20, 2010 You know there is 6 exhaust valves and 6 inlet valves. With the inlet ones being bigger. So 2 different sizes in each head. As far as I am aware there is no difference between OBD1 and OBD2 mate. Link to post Share on other sites
bungy 2 Posted December 20, 2010 Report Share Posted December 20, 2010 lol sorry peeps just worries me why there are two types of valves ! as im cleaning them up and finds these sorts of things ! next is the block ! wish me luck i will need it ! I'm the worst one for having no patience. I've had a search and found nothing yet. I'm sure one of the guru's will confirm soon enough.This is all I've found so far: 39.0 millimetres intake valves and 34.3 millimetres exhaust valves. Hope it helps. Link to post Share on other sites
Pearsy47 1 Posted December 20, 2010 Author Report Share Posted December 20, 2010 yeah im hoping so bungy ! And d@ver yeah i know which is which but its weird its the inlet valves which tapers from the stem to the valve its weird! Link to post Share on other sites
cabrioman 6 Posted December 20, 2010 Report Share Posted December 20, 2010 there is no difference in the valves between OBD1 and 2 the only difference in the heads is the casting shape and one has slightly better oil flow as far as i remember ... Link to post Share on other sites
bungy 2 Posted December 20, 2010 Report Share Posted December 20, 2010 yeah im hoping so bungy ! And d@ver yeah i know which is which but its weird its the inlet valves which tapers from the stem to the valve its weird! Could they be after market valves that have been fitted? Link to post Share on other sites
legvw 0 Posted December 20, 2010 Report Share Posted December 20, 2010 there is no difference in the valves between OBD1 and 2 the only difference in the heads is the casting shape and one has slightly better oil flow as far as i remember ...Well i never knew that. It is true that you learn something new every day! Link to post Share on other sites
cabrioman 6 Posted December 20, 2010 Report Share Posted December 20, 2010 yeah if you fitt a rotrex charger system some heads you have shave a wee bit off the side of the head to allow clearance for the tensioner ..... Link to post Share on other sites
Pearsy47 1 Posted December 21, 2010 Author Report Share Posted December 21, 2010 right here is a pic of the two different valves. The valve on the left is the one i bent and came off the motor. The valve on the right came of a vr up the breakers and only now i seen the difference anyone know why they are different ?? Link to post Share on other sites
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